Update .github/workflows/performance.yml

Author: ncooke3

.github/workflows/performance.yml

@@ -14,7 +14,7 @@ on:
       - '!performance/SwiftUIPerformanceQuickstart/PerformanceExample/*.md'
       - '!performance/SwiftUIPerformanceQuickstart/PerformanceExample/Design/**'
   pull_request:
-    branches: [ main, nc/quickstarts ]
+    branches: [ main ]
     paths:
       - '.github/workflows/performance.yml'
       - 'performance/**'