[webapi] Update w3c TCs for Canvas

Impacted Suites: tct-canvas-html5-tests
Impacted TCs num: New 0, Update 791, Delete 1
Unit test platform: Tizen IVI
Tizen IVI test result summary: Pass 782, Fail 9, Blocked 0

Delete reason: The TC(canvas_colorsandstyles_addcolorstop_001.htm ) has been removed by w3c.