Add frenzibyte to users that can use diffcalc workflow

.github/workflows/diffcalc.yml

@@ -111,7 +111,7 @@ jobs:
     steps:
       - name: Check permissions
         run: |
-          ALLOWED_USERS=(smoogipoo peppy bdach)
+          ALLOWED_USERS=(smoogipoo peppy bdach frenzibyte)
           for i in "${ALLOWED_USERS[@]}"; do
               if [[ "${{ github.actor }}" == "$i" ]]; then
                   exit 0