Adjustments for line height in the text label

[alburdette619]

The line height was not being scaled with the font size. This lead to the height of the actual label not changing when it was animated to the active state. Also removed the annoying value result that raises a proptypes warning when value is empty.

[codypearce]

@alburdette619 tests seem to be failing

[codypearce]

The line height seems to be pushing the text a little to high on web