VE-1340: Adjust ve.ui.WikiaMediaOptionWidget to load maps thumbnails as well

It is a temporary and sort of dirty fix - marked as FIXME.
VE-1340: Minor code formatting adjustments
VE-1289: More adjustments to WikiaMediaInsertDialog
Merge pull request #4165 from Wikia/VE-1340

VE-1340: Adjust ve.ui.WikiaMediaOptionWidget to load maps thumbnails as well
Merge pull request #4166 from Wikia/VE-1289

VE-1289: More adjustments to WikiaMediaInsertDialog
Merge branch 've-sprint-22' into VE-1321

Conflicts:
	extensions/VisualEditor/wikia/modules/ve/ui/widgets/ve.ui.WikiaMediaOptionWidget.js