CI: Disable test discovery on AppVeyor

appveyor.yml

@@ -32,4 +32,6 @@ before_deploy:
   - C:\projects\obs-studio\CI\before-deploy-win.cmd
 
 deploy_script:
-  - ps: Push-AppveyorArtifact "build.zip" -FileName "$(git describe).zip"
+  - ps: Push-AppveyorArtifact "build.zip" -FileName "$(git describe).zip"
+
+test: off