Fix xtce_converter

[jmthomas]

closes #207

[jmthomas]

Sample output:

jmthomas@Jasons-MacBook-Air-2 openc3 % ./openc3.sh cli xtce_converter --plugin openc3-demo-1.0.0.gem --output output2                        
Installing openc3-demo-1.0.0.gem
Converting target INST to .xtce files in output2/INST
Converting target INST2 to .xtce files in output2/INST2
Converting target EXAMPLE to .xtce files in output2/EXAMPLE
Converting target TEMPLATED to .xtce files in output2/TEMPLATED
Converting target SYSTEM to .xtce files in output2/SYSTEM
/usr/local/lib/site_ruby/3.1.0/rubygems/uninstaller.rb:98:in `uninstall': gem "openc3-demo" is not installed (Gem::InstallError)
    from /openc3/bin/openc3cli:261:in `xtce_converter'
    from /openc3/bin/openc3cli:518:in `<main>'
Uninstalling openc3-demo, version 1.0.0

Not sure if I should just remove the uninstall logic or not

[codecov]

Codecov Report

Base: 74.18% // Head: 74.15% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (49c8815) compared to base (9ed3c5a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #219      +/-   ##
==========================================
- Coverage   74.18%   74.15%   -0.03%     
==========================================
  Files         416      416              
  Lines       25662    25662              
  Branches      562      562              
==========================================
- Hits        19037    19030       -7     
- Misses       6540     6549       +9     
+ Partials       85       83       -2     

Flag	Coverage Δ
frontend	75.43% <ø> (-0.09%)	⬇️
ruby-api	44.04% <ø> (ø)
ruby-backend	78.70% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
openc3/lib/openc3/utilities/metric.rb	90.19% <0.00%> (-5.89%)	⬇️
...enc3-tool-calendar/src/tools/Calendar/Calendar.vue	61.37% <0.00%> (-5.52%)	⬇️
...blemanager/src/tools/TableManager/TableManager.vue	72.77% <0.00%> (-1.05%)	⬇️
...riptrunner/src/tools/ScriptRunner/ScriptRunner.vue	71.78% <0.00%> (+0.88%)	⬆️

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