Fix deadlock in blocking_dispatch

[jleedev]

If dispatch_inner_queue dispatches some events, blocking_dispatch will still wait for some events to come in, rather than turning the loop again and checking its done variable. This is causing Alacritty 0.13 to hang on startup.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2d5e7df) 75.34% compared to head (fe5d265) 75.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #695      +/-   ##
==========================================
- Coverage   75.34%   75.34%   -0.01%     
==========================================
  Files          48       48              
  Lines        8258     8257       -1     
==========================================
- Hits         6222     6221       -1     
  Misses       2036     2036              

Flag	Coverage Δ
main	58.37% <0.00%> (+0.01%)	⬆️
test--	81.08% <100.00%> (-0.01%)	⬇️
test--server_system	64.50% <100.00%> (-0.01%)	⬇️
test-client_system-	72.15% <100.00%> (-0.01%)	⬇️
test-client_system-server_system	54.82% <100.00%> (-0.01%)	⬇️

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