Use UNITY_LICENSE-only activation in CI

Author: manaporkun

.github/workflows/webgl-pages.yml

@@ -35,8 +35,6 @@ jobs:
       - name: Build WebGL project
         uses: game-ci/unity-builder@v4
         env:
-          UNITY_EMAIL: ${{ secrets.UNITY_EMAIL }}
-          UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
           UNITY_LICENSE: ${{ secrets.UNITY_LICENSE }}
         with:
           unityVersion: auto