SDL pipelines should run even if no code changes (#236)

Author: walbourn

build/DirectXMath-SDL.yml

@@ -8,9 +8,6 @@
 schedules:
 - cron: "0 3 * * 0,3,5"
   displayName: 'Three times a week'
-  branches:
-    include:
-    - main
   always: true
 
 # GitHub Actions handles CodeQL and PREFAST for CI/PR