"SVN Commit" action is now active on file addition.

Summary:
Adding a file causes no "SVN Commit" action available. This commit fixes an issue.
It is now possible to add single file (or files) and do SVN commit.

Reviewers: Dolphin, elvisangelaccio

Reviewed By: Dolphin, elvisangelaccio

Subscribers: elvisangelaccio

Differential Revision: https://phabricator.kde.org/D26204