ENYO-579: Marquee takes big initiating time on _marquee_detectAlignment

Issue:
The detect alignment takes long time on creation time.

Fix:
Skip detect alignment when enyo.Control.prototype.rtl is false, so that we can skip detect alignment on non RTL locale.
(This is short term fix.)

DCO-1.1-Signed-Off-By: Kunmyon Choi kunmyon.choi@lge.com
Hi @KunmyonChoi will this take into account the case where we're in a locale with LTR directionality but the content has RTL directionality? I opened a PR to address this a bit more generally (related to ENYO-561): https://github.com/enyojs/moonstone/pull/1803