fix(test): Ensure the web channel tests complete.

The page check in the FunctionalHelpers fillOut* functions were not correctly checking for the ? character in the URL. Updated to ensure both EOL and ? characters are matched.

fixes #1884
Merge pull request #1886 from mozilla/issue-1884-web-channel-test-stall

fix(test): Ensure the web channel tests complete. r=vladikoff