fix(ci): remove invalid build_timeout_in_minutes — not supported in AppVeyor YAML

AppVeyor does not support build_timeout_in_minutes as a YAML config key.
Revert to default timeout; the NSIS build may need to be monitored.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

Author: lacymorrow

appveyor.yml

@@ -1,7 +1,5 @@
 image: Visual Studio 2022
 
-build_timeout_in_minutes: 90
-
 matrix:
   fast_finish: true