Fixed missing .units on CoordinateComponent

[astrofrog]

This was an oversight, we should pull in the units from the WCS

[codecov]

Codecov Report

Merging #2117 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2117      +/-   ##
==========================================
+ Coverage   87.99%   88.05%   +0.06%     
==========================================
  Files         245      245              
  Lines       22318    22322       +4     
==========================================
+ Hits        19638    19655      +17     
+ Misses       2680     2667      -13     

Impacted Files	Coverage Δ
glue/core/component.py	97.05% <100.00%> (+0.05%)	⬆️
glue/app/qt/application.py	79.69% <0.00%> (+1.05%)	⬆️
glue/viewers/matplotlib/qt/widget.py	81.81% <0.00%> (+3.40%)	⬆️
glue/__init__.py	70.37% <0.00%> (+3.70%)	⬆️

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