[uievents-tests] Rename "mtest" to -manual. (#2923)

Manual tests are to have the suffix -manual on the filename as per
https://github.com/w3c/web-platform-tests/blob/master/docs/manual-test.md

This allows the uievents to be imported by these tests to be skipped
in Chromium via its deps_updater.py which searches for -manual.html
at the end of the filename.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/2923

Received on Thursday, 28 April 2016 13:33:29 UTC