Getting rid of the plug-in leaves Xcode's native single-file find disabled.

After finding that XcodeSFF's dialog doesn't entirely work, I removed the plug-in from Contents/PlugIns in the Xcode.app bundle (the documented location under /Library/Applications Support/Xcode does not exist; perhaps that info is outdated).

The plug-in of course was removed, but Xcode's regular SFF functionality did not return, and I'm left with no single-file search at all. 
