Bugfix/command line

[breiler]

Fixes the problem with issue #1019.

It will now save the focus state of the command text field an refocus once it's enabled again.
Also fixed a small issue where the left and right arrow keys weren't usable.

[codecov-io]

Codecov Report

Merging #1028 into master will decrease coverage by 0.02%.
The diff coverage is 17.64%.

@@             Coverage Diff              @@
##             master    #1028      +/-   ##
============================================
- Coverage     29.79%   29.77%   -0.03%     
  Complexity     1021     1021              
============================================
  Files           143      143              
  Lines         10049    10060      +11     
  Branches        913      917       +4     
============================================
+ Hits           2994     2995       +1     
- Misses         6767     6777      +10     
  Partials        288      288

Impacted Files	Coverage Δ	Complexity Δ
...salgcodesender/uielements/panels/CommandPanel.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...lwinder/universalgcodesender/model/GUIBackend.java	45.75% <0%> (ø)	57 <0> (ø)	⬇️
...esender/uielements/components/CommandTextArea.java	65.67% <25%> (-8.47%)	10 <1> (ø)

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