[CIS-1094] Fix ChannelListController.synchronize not calling completion

[b-onc]

...when connected in offline mode

This happened because the EventObserver didn't get connected callback when we're already connected

[codecov-commenter]

Codecov Report

Merging #1353 (37c2c9d) into main (08b7477) will decrease coverage by 0.01%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##             main    #1353      +/-   ##
==========================================
- Coverage   90.75%   90.73%   -0.02%     
==========================================
  Files         224      224              
  Lines        9800     9805       +5     
==========================================
+ Hits         8894     8897       +3     
- Misses        906      908       +2     

Flag	Coverage Δ
llc-tests	90.73% <20.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
.../ChannelListController/ChannelListController.swift	82.45% <20.00%> (-1.04%)	⬇️

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[tbarbugli]

LGTM