[actions] fix flutter_analysis formatting step

[GroovinChip]

I tried to set up the "Format code" step to auto-commit and push any changes from running dart format, but the job fails if there are any changes because I left in --set-exit-if-changed.

It should look like this:

      - name: Format code
        run: |
          dart format .
          if [ $? -eq 1 ]; then
            git add .
            git commit -m "chore: formatting corrections"
            git push
            echo "Code has been formatted and changes have been committed and pushed."
          fi
          echo "All code is properly formatted!"