TextLine is using wordSpcing for justification. And previously,
TextLine will overwrite wordSpcing even justification is not on.
This CL make sure that TextLine only changes wordSpcing when
justification is on.
Bug: 122471618
Test: atest TextLineTest
Change-Id: I6f1e2f6c17b65f92d7a5bb064fdafbf5df9ef8f7