fix(telegram/updates): treat all messages from getChannelDifference as channel messages

[shadowspore]

No description provided.

[codecov]

Codecov Report

Merging #870 (52a478c) into main (9558531) will decrease coverage by 0.03%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##             main     #870      +/-   ##
==========================================
- Coverage   69.76%   69.72%   -0.04%     
==========================================
  Files         444      444              
  Lines       21169    21168       -1     
==========================================
- Hits        14768    14759       -9     
- Misses       5465     5471       +6     
- Partials      936      938       +2     

Impacted Files	Coverage Δ
telegram/updates/state.go	51.28% <50.00%> (ø)
telegram/updates/state_channel.go	52.83% <100.00%> (ø)
telegram/updates/utils.go	41.07% <100.00%> (-1.04%)	⬇️
tgtest/send.go	54.05% <0.00%> (-5.41%)	⬇️
tgtest/loop.go	65.00% <0.00%> (-5.00%)	⬇️
internal/proto/codec/intermediate.go	95.08% <0.00%> (-4.92%)	⬇️
tgtest/server.go	79.66% <0.00%> (-3.39%)	⬇️
tgtest/handle.go	37.25% <0.00%> (-2.95%)	⬇️
telegram/updates/gap_buffer.go	82.14% <0.00%> (+10.71%)	⬆️
telegram/updates/update.go	100.00% <0.00%> (+28.57%)	⬆️

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