fix(dialogs): check iterator end correctly

[tdakkota]

No description provided.

[codecov]

Codecov Report

Merging #698 (616c36a) into main (42accec) will decrease coverage by 0.29%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #698      +/-   ##
==========================================
- Coverage   69.58%   69.28%   -0.30%     
==========================================
  Files         430      430              
  Lines       20523    20523              
==========================================
- Hits        14281    14220      -61     
- Misses       5332     5399      +67     
+ Partials      910      904       -6     

Impacted Files	Coverage Δ
telegram/query/dialogs/iter.go	67.34% <100.00%> (ø)
telegram/updates/update.go	9.52% <0.00%> (-90.48%)	⬇️
telegram/updates/state_apply.go	25.58% <0.00%> (-11.63%)	⬇️
telegram/updates/gap_buffer.go	71.42% <0.00%> (-10.72%)	⬇️
telegram/updates/state_channel.go	45.75% <0.00%> (-7.08%)	⬇️
telegram/updates/internal/e2e/server.go	65.38% <0.00%> (-6.16%)	⬇️
telegram/updates/internal/e2e/storage_mem.go	53.78% <0.00%> (-6.07%)	⬇️
internal/mtproto/conn.go	92.22% <0.00%> (-3.34%)	⬇️
internal/proto/gzip.go	80.00% <0.00%> (-3.00%)	⬇️
telegram/updates/state.go	48.71% <0.00%> (-2.57%)	⬇️
... and 7 more

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