BHV-17963: moon.Header showing sub Title on the right side when content ...

...is English and country is RTL

Issue:
moon.Header is changing it's text-alignment based on whether language setting is RTL or not
But, title and sub-title position is fixed because we are using HTML tag like this: "title <span> subtitle </span>".
So, if we are using English in RTL locale then subtitle is still positioned on right side of title.

Fix:
Switch sub-title position based on enyo.Control.prototype.rtl, so that subtitle can be positioned on left side of title in RTL locale.

DCO-1.1-Signed-Off-By: Kunmyon Choi kunmyon.choi@lge.com
I believe this should be `this.rtl` instead of referencing the prototype. Was there a reason you needed to do that?