jqueryMsg: Don't fall back to simple parser when jQuery params passed

jqueryMsg: Don't fall back to simple parser when jQuery params passed

jqueryMsg parsing is required when the message body contains wikitext,
but it is also required when one of the parameters is a jQuery object.

Without this change, the following doesn't work:
	mw.messages.set( 'foo', 'Hello $1' );
	mw.message( 'foo', $( '<a>' ).text( 'World' ) ).parse();

(But if the message contained e.g. {{PLURAL:}} syntax, it did work.)

Change-Id: I445f9194bb8b2ed35baafbda30d1d0d008b64e2c