ci: Fix size check action to run on master (#6248)

Author: mydea

.github/workflows/build.yml

@@ -228,7 +228,7 @@ jobs:
     timeout-minutes: 15
     runs-on: ubuntu-latest
     # Size Check will error out outside of the context of a PR
-    if: github.event_name == 'pull_request' || startsWith(github.ref, 'refs/heads/master/')
+    if: github.event_name == 'pull_request' || github.ref == 'refs/heads/master'
     steps:
       - name: Check out current commit (${{ needs.job_get_metadata.outputs.commit_label }})
         uses: actions/checkout@v3