changing UCM from Static to None to avoid unnecessary build checks

https://jenkins.debian.net/job/reproducible_fdroid_build_apps/lastSuccessfulBuild/consoleText contains a lot of entries like

VCS error while building app org.tunesremote: SVN certificate pre-validation failed: 404 Client Error: Not Found for url: https://tunesremote-plus.googlecode.com/svn/trunk

All affected apps seem to have two things in common:

• sources are hosted with GoogleCode (and hence not updated for ages already)
• UCM is set to Static

After a discussion on IRC with @uniqx this MR now shall check whether switching UCM to None might keep our build process from trying them (there are no new builds to perform for them anyway, so it is not clear why those errors are happening at all). Should the 3 candidates tested here then disappear from the list while the other remain, those remaining could be handled the same way.