parse port in birger init

[danjampro]

Fixes a bug where the port is not parsed on Birger focuser init function.

How Has This Been Tested?

Tested on hardware.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (develop@4c79b00). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #1133   +/-   ##
==========================================
  Coverage           ?   83.09%           
==========================================
  Files              ?       86           
  Lines              ?     7390           
  Branches           ?      627           
==========================================
  Hits               ?     6141           
  Misses             ?     1076           
  Partials           ?      173           

Impacted Files	Coverage Δ
src/panoptes/pocs/__init__.py	100.00% <ø> (ø)
src/panoptes/pocs/base.py	100.00% <ø> (ø)
src/panoptes/pocs/camera/__init__.py	70.78% <ø> (ø)
src/panoptes/pocs/camera/camera.py	84.09% <ø> (ø)
src/panoptes/pocs/camera/gphoto/__init__.py	100.00% <ø> (ø)
src/panoptes/pocs/camera/gphoto/base.py	100.00% <ø> (ø)
src/panoptes/pocs/camera/sdk.py	88.63% <ø> (ø)
src/panoptes/pocs/camera/simulator/ccd.py	94.52% <ø> (ø)
src/panoptes/pocs/camera/simulator/dslr.py	95.58% <ø> (ø)
src/panoptes/pocs/core.py	92.64% <ø> (ø)
... and 2 more

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