Revert "Center text in remove ad popover"

This reverts commit 5d205033b1acfc4ba40d59d836cae0d513e75eee.

Conflicts:
	public/css/tasks.styl
Revert 94ec31c..cde03f6

This rolls back to commit 94ec31c7503a9101186faee677b0f8bf5d3a61c8.
Center text in remove ad popover