.github/workflows: fix bash condition syntax for showing git diff

Fixes 'integer expression expected' error

Date: 2021-03-17 07:14:20-05:00
Signed-off-by: meows <[email protected]>

Author: meowsbits

.github/workflows/audit-bootnodes.yml

@@ -62,7 +62,7 @@ jobs:
               fi
             done
           done < <(find ./params -type f -name '*bootnode*go')
-          test "$GITHUB_EVENT_NAME" -ne "pull_request" && git --no-pager diff
+          if [[ $GITHUB_EVENT_NAME != pull_request ]]; then git --no-pager diff; fi
           exit $status
 
       - name: Create Pull Request