fix: re-enable flask multi-threading

[ShootingKing-AM]

To solve issue: ActivityWatch/activitywatch#773

[ShootingKing-AM]

@ErikBjare meow?

[ErikBjare]

I'm worried this might have unintended side-effects (cause race-conditions in heartbeats etc), so a bit hesitant to merge this.

Hopefully some test would fail if that's the case, but for some reason it seems that CI hasn't run on this PR?

[ShootingKing-AM]

It seems to be waiting for approval, you can also re run workflow manually

[ErikBjare]

Must've been some bug in the GitHub mobile UI, approved now :)

[codecov]

Codecov Report

Base: 55.93% // Head: 55.93% // No change to project coverage 👍

Coverage data is based on head (68f8d6c) compared to base (c12f912).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #94   +/-   ##
=======================================
  Coverage   55.93%   55.93%           
=======================================
  Files          11       11           
  Lines         615      615           
=======================================
  Hits          344      344           
  Misses        271      271           

Impacted Files	Coverage Δ
aw_server/server.py	82.45% <ø> (ø)

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[ErikBjare]

Alright, merged #95 so now I'm less worried about thread safety.

Merging :)