Skin: Remove more use of QuickTemplate::setRef()
Follows-up
2c01147c13be.
* language_links: The local array variable is only used once to
obtain the value from Skin::getLanguages(), and then never passed
elsewhere or otherwise potentially changed, so this reference
doesn't seem useful.
The getLanguages() method itself also creates a new array every
time it is called, so the reference from there can't change either.
* Same for content_navigation and content_actions. These are never
modified, and the method that returns the array creates a new one
on each call.
Follows-up r3014 (
f4755755daed1f8).
* Same for bodytext.
Presumably these were only set as references to save memory.
Bug: T140664
Change-Id: I1224a7a89c1d7ad05c73132ff73299fd78ade7fb