Add local device to discovery menu

[andrewdavidmackenzie]

Fixes #694

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.

Project coverage is 29%. Comparing base (5b910e4) to head (3bb4fda).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/piggui.rs	0%	22 Missing ⚠️
src/discovery.rs	0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##           master   #759   +/-   ##
=====================================
- Coverage      29%    29%   -0%     
=====================================
  Files          45     45           
  Lines        5823   5829    +6     
=====================================
  Hits         1637   1637           
- Misses       4186   4192    +6     

Flag	Coverage Δ
unittests	29% <0%> (-<1%)	⬇️

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