[Github] Fix typo

I swore I copied the if statement from somewhere, but whatever I did to
it while moving it over dropped one of the equals signs. This patch
fixes that so the action will actually work properly.

.github/workflows/scorecard.yml

@@ -22,7 +22,7 @@ jobs:
   analysis:
     name: Scorecard analysis
     runs-on: ubuntu-latest
-    if: github.repository = 'llvm/llvm-project'
+    if: github.repository == 'llvm/llvm-project'
     permissions:
       # Needed to upload the results to code-scanning dashboard.
       security-events: write