Removing button-float-right rule from jquery.ui/vector theme

Removing button-float-right rule from jquery.ui/vector theme

- Fixes:
 * (bug 35046) [Regression] jquery.ui buttons order reversed in Vector

The Vector css has this non-standard rule:
> .ui-dialog .ui-dialog-buttonpane button { float: right; }

That rule was causing the first button to be on the right, the second button
to be on the left of that and so forth. Per jQuery UI documentation and all
other scripts, plugins and skins ever written by and for jQuery UI, the order
is wrong in Vector, and right in all other skins.

See for example: http://jqueryui.com/demos/dialog/#modal-confirmation

$( "<div>" ).dialog({
	height: 140,
	buttons: {
		"Delete all items": function() {
			$( this ).dialog( "close" );
		},
		Cancel: function() {
			$( this ).dialog( "close" );
		}
	}
});

The "Delete all items" is the first button and "Cancel" to the right of that (as it should be).

That is restored in Vector by removing said css rule from
 /resources/jquery.ui/themes/vector/jquery.ui.dialog.css

and instead adding a float rule for the button container, copied from
the default jQuery UI theme:

 /resources/jquery.ui/themes/default/jquery.ui.dialog.css : line 18

Other plugins/skins are not affected.

Change-Id: I18752aa0fe21dd3c5bc5bd4a830faaa4c836f9cd