Fix broken layout on dialog footer

Merged Nate Graham requested to merge ngraham/knewstuff:fix-footer into master

Requires kdeclarative!135 (merged)

With the aid of the new extraFooterTopPadding: property in GridViewKCM, we can fix the broken layout on the footer while simultaneously removing a few layout hacks that didn't work as intended.

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Edited by Nate Graham

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