[dirty] Fix Password Protected Folders

[kobergj]

Just to be crystal clear: I don't like the fix very much. But it could help avoiding the password policies on Password Protected Folders.

@2403905 what do you think? How much do you NOT like it?

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[2403905]

@kobergj We could use It but:

1. Should we check if the ".PasswordProtectedFolders" is in a Personal space root to avoid some manipulation going around the password policies for the regular public links like <roo>/<subfolder>/.PasswordProtectedFolders/?
2. If user able to update the password we should fix the UpdatePublicShare to

   reva/internal/grpc/services/publicshareprovider/publicshareprovider.go

   Line 592 in 150e096

   if updatePassword && len(setPassword) > 0 {

3. Is these changes relevant for the osc ?https://github.com/cs3org/reva/blob/edge/internal/http/services/owncloud/ocs/handlers/apps/sharing/shares/public.go