vscode: Protocol: "inspector" inside launch.json is ignored

Issue Type: Bug

Steps:

1. Create following configuration for mocha/typescript unit tests:

{
  "type": "node",
  "request": "launch",
  "protocol": "inspector",
  "name": "Mocha Current File",
  "program": "${workspaceFolder}/packages/common/node_modules/mocha/bin/_mocha",
  "args": [
    "-r",
    "ts-node/register",
    "--timeout",
    "999999",
    "--colors",
    "${file}"
  ],
  "console": "integratedTerminal",
  "internalConsoleOptions": "neverOpen"
}

1. Run test against selected typescript spec file

Actual:

• Getting modal with following error: Cannot connect to runtime via 'legacy' protocol; try to use 'inspector' protocol.
• Getting deprecation warning (node:26438) [DEP0062] DeprecationWarning: 'node --debug' and 'node --debug-brk' are invalid. Please use 'node --inspect' or 'node --inspect-brk' instead. inside of a terminal, as if protocol: legacy was set in launch.json configuration.

Same configuration works perfectly well on latest stable version of VSCode (just finished running both side by side).

Expected:

• Debugger launches, attaches to mocha test run and triggers breakpoints, same as for VSCode’s latest stable version (Version 1.26.1 (1.26.1)).

VS Code version: Code - Insiders 1.27.0-insider (7b9afc4196bda60b0facdf62cfc02815509b23d6, 2018-09-03T09:07:33.052Z) OS version: Darwin x64 17.7.0

System Info

Item	Value
CPUs	Intel® Core™ i7-4770HQ CPU @ 2.20GHz (8 x 2200)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Load (avg)	5, 4, 3
Memory (System)	16.00GB (0.03GB free)
Process Argv	/Applications/Visual Studio Code - Insiders.app/Contents/MacOS/Electron
Screen Reader	no
VM	0%

Extensions (60)

Extension	Author (truncated)	Version
json-to-ts	Mar	1.5.5
vscode-html-scss	P-d	0.0.42
indenticator	Sir	0.6.0
html-css-class-completion	Zig	1.17.1
vscode-file-peek	abi	1.0.1
html-snippets	abu	0.2.1
vscode-ngrx-snippets	ahs	0.0.4
ng-template	Ang	0.1.10
npm-intellisense	chr	1.3.0
path-intellisense	chr	1.4.2
vscode-svgviewer	css	1.4.4
vscode-eslint	dba	1.5.0
vscode-protractor-snippets	dee	1.0.5
githistory	don	0.4.2
xml	Dot	2.3.2
vscode-babel-coloring	dza	0.0.4
gitlens	eam	8.5.6
EditorConfig	Edi	0.12.4
tslint	eg2	1.0.38
vscode-npm-script	eg2	0.3.5
prettier-vscode	esb	1.6.1
git-project-manager	fel	1.6.1
vscode-yarn	gam	1.6.0
todo-tree	Gru	0.0.82
beautify	Hoo	1.4.2
docthis	joe	0.7.1
angular-essentials	joh	0.4.0
Angular2	joh	6.1.5
vscode-colorize	kam	0.7.1
es6-angular-snips	kas	0.0.3
MagicPython	mag	1.0.12
code-coverage	mar	0.0.2
HTMLHint	mka	0.5.0
prettify-json	moh	0.0.3
vscode-scss	mrm	0.6.2
python	ms-	2018.7.1
debugger-for-chrome	msj	4.9.1
angular2-inline	nat	0.0.17
material-icon-theme	PKi	3.5.3
polymer-ide	pol	0.6.0
seti-icons	qin	0.1.3
vscode-sort-json	ric	1.13.0
vscode-icons	rob	7.25.0
sass-indented	rob	1.4.9
vscode-coverage-gutters	rya	2.1.1
salesforcedx-vscode	sal	43.14.0
salesforcedx-vscode-apex	sal	43.14.0
salesforcedx-vscode-apex-debugger	sal	43.14.0
salesforcedx-vscode-apex-replay-debugger	sal	43.14.0
salesforcedx-vscode-core	sal	43.14.0
salesforcedx-vscode-lightning	sal	43.14.0
salesforcedx-vscode-visualforce	sal	43.14.0
code-settings-sync	Sha	3.1.2
stylelint	shi	0.42.0
simontest	Sim	0.18.4
python	tht	0.2.3
vsfire	tob	1.3.2
vscode-todo-highlight	way	1.0.4
JasmineSnippets	xab	1.0.1
JavaScriptSnippets	xab	1.7.0

(3 theme extensions excluded)