Fix typo in svg/dynamic-updates/SVGFEBlendElement-dom-in2-attr.html

This test is not intended to test error-handling, so add the missing '#'.

https://bugs.webkit.org/show_bug.cgi?id=158017

BUG=614306

Review-Url: https://codereview.chromium.org/2004023002
Cr-Commit-Position: refs/heads/master@{#395597}
2 files changed