ocis: renaming of files/folders shows an error in phoenix

1. checkout #409
2. start ocis with bin/ocis server
3. start a redis server docker run --rm -e REDIS_DATABASES=1 -p 6379:6379 -d webhippie/redis:latest
4. login to phoenix
5. upload a file
6. try to rename the file

file is renamed but the popup does not disappear and an error is shown saying that there was an error renaming

Phoenix sends two MOVE requests, one is successful the second one received a 500 response

OCIS log:

2020-08-13T08:45:35+05:45 ERR home/artur/go/pkg/mod/github.com/cs3org/reva@v1.1.0/internal/grpc/services/storageprovider/storageprovider.go:439 > error moving file error="ocfs: error moving /var/tmp/reva/data/4c510ada-c86b-4815-8820-42cdf82c3d51/files/settings.txt to /var/tmp/reva/data/4c510ada-c86b-4815-8820-42cdf82c3d51/files/renamed.txt: rename /var/tmp/reva/data/4c510ada-c86b-4815-8820-42cdf82c3d51/files/settings.txt /var/tmp/reva/data/4c510ada-c86b-4815-8820-42cdf82c3d51/files/renamed.txt: no such file or directory" pkg=rgrpc service=reva traceid=a4d196337cd4c1ba8ed3f896af2db67b