add brave://adblock tests to Android manual passes

Same as https://github.com/brave/qa-resources/issues/503 but for Android:

We should add some tests for brave://adblock (brave://settings/shields/filters) to our manual passes to ensure this page works as expected with major Chromium bumps.

See also https://github.com/brave/qa-resources/issues/503#issuecomment-1424894628 from @kjozwiak

Start by reviewing qa-resources issue 503 and its referenced comment, then inspect the Android manual-pass materials for where brave://adblock (brave://settings/shields/filters) is covered. Done means the relevant manual checks are added and verify that the page works as expected after major Chromium bumps.

Written by the indexing model from the issue text.