[misc-sanity] Remove the input for WebGL

Impacted Suites: webapi-sanityapp-w3c-tests
Impacted TCs num: New 0, Update 1, Delete 0
Unit test Platform: Tizen, Andriod
Tizen test result summary: Pass 1, Fail 0, Blocked 0
Andriod test result summary: Pass 1, Fail 0, Blocked 0