ui: augment pairing message for devices with multiple channels

[pfps]

Fixes #2622

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

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Files with missing lines	Patch %	Lines
lib/solaar/cli/pair.py	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2625   +/-   ##
=========================================
  Coverage          ?   47.93%           
=========================================
  Files             ?       52           
  Lines             ?    14343           
  Branches          ?     2817           
=========================================
  Hits              ?     6875           
  Misses            ?     7082           
  Partials          ?      386           

Flag	Coverage Δ
unittests	47.89% <66.66%> (?)

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