build: fix travis required tests not running

* Fixes that the `travis_required` CI mode isn't running. This mode is important for Firefox and Chrome testing.

Author: devversion

.travis.yml

@@ -30,7 +30,7 @@ jobs:
     - env: "MODE=saucelabs_required"
     - env: "MODE=browserstack_required"
     - env: "MODE=travis_required"
-      env: "DEPLOY_MODE=build-artifacts"
+    - env: "DEPLOY_MODE=build-artifacts"
     - env: "DEPLOY_MODE=docs-content"
     - env: "DEPLOY_MODE=screenshot-tool"
     - env: "DEPLOY_MODE=dashboard"