[html-tests] Fix <img sizes='calc(1px'> test (#1274)

http://dev.w3.org/csswg/css-values/#calc-syntax

Omitting the right paren makes it not match the syntax so it should be invalid.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/1274

Received on Tuesday, 7 October 2014 07:25:58 UTC