1.0.1dev: Follow-up to [11487], restore centering of plugin enable checkboxes.
1.0.1dev: Follow-up to [11487], restore centering of plugin enable checkboxes.

Part of #11003.


git-svn-id: 3bd1c7f5b9365705bff4dd56977498491f5ac132@11500 af82e41b-90c4-0310-8c96-b1721e28e2e2

exocad/exotrac,exocad/exotrac,exocad/exotrac,exocad/exotrac