Remove unused "VersionControl" entries from kdev4 samples/templates

Summary:
The actual key is "VersionControlSupport", and it is only used with
the developer kdev4 file.

Reviewers: #kdevelop, kfunk

Reviewed By: #kdevelop, kfunk

Subscribers: kdevelop-devel

Differential Revision: https://phabricator.kde.org/D5512