Fix not working 'Hide Whitespace changes' toggle

Review Request #3832 — Created Feb. 2, 2013 and submitted — Latest diff uploaded

Review Board
The 'Hide Whitespace changes' toggle does not work on multiple browsers: Chrome/Firefox/Opera.

Clicking the toggle for a diff with whitespace changes should dim references to the whitespace changes and stop highlighting the changes. Instead the button does nothing and a javascript error is thrown: Uncaught Error: Syntax error, unrecognized expression: ol.index a[href=#5.2]
Uploaded a diff with whitespace changes and modified the jquery selector for the changes references inside Chrome's developer tool.