[ot] .github: workflows: Fix format test in CI

Signed-off-by: Amaury Pouly <[email protected]>

Author: pamaury

.github/workflows/build_test.yaml

@@ -81,7 +81,7 @@ jobs:
         uses: actions/checkout@v4
       - name: Check C code format
         run: |
-          scripts/opentitan/ot-format.sh --ci -i
+          scripts/opentitan/ot-format.sh --ci --Werror --dry-run
 
   lint-python:
     runs-on: ubuntu-latest