Refactor another live preview scenario

But left it disabled because of bug 57967

Bug: 57967
Change-Id: I7b1543f526eac93c9a0200731a722332a7410b06
Removing font live preview test

* This feature is named live preview of language
* There are two scenarios in font selection feature that also
  test live preview
* This test is actually making changes as well

Change-Id: I799698e08fc3d922259692de7ae0bbf5cbfd0a33
Merge changes I799698e0,I7b1543f5

* changes:
  Removing font live preview test
  Refactor another live preview scenario