Update latex-builder.yml

Author: madvid

.github/workflows/latex-builder.yml

@@ -36,7 +36,7 @@ jobs:
     runs-on: ubuntu-latest
     container:
       image: blang/latex:ubuntu
-    if: "contains(github.ref, 'master')" || "contains(github.ref, 'closing')"
+    if: "contains(github.ref, 'master') || contains(github.ref, 'closing')"
     steps:
       - name: checkout repo
         uses: actions/checkout@v2