Correctly update the context info when changing paths.

[thet]

Do only remove the correct event listener on context-info-loaded before adding a new one.
Fixes a problem where the current path was not updated for the upload popup when changing paths.
Fixes: #1016
Refs: #1028, #1030, #1039

[fredvd]

LGTM!

In hindsight, instead of passing the function, I used the 'namespace' last year to fix other event listeners. That could have worked here as well:

mockup/mockup/patterns/structure/js/views/textfilter.js

Line 44 in bef28e9

.off('click.textfilter').on('click.textfilter', function() {

But that was done on browsers events like 'click', not our own custom events. Passing the function what you do here is clearer than the namespace magic of jQuery.

tested the branch locally.

[thet]

The namespace thing is really magic and not quite self-explanatory.
Tnx for reviewing!

[mauritsvanrees]

Released in mockup 3.2.5 and plone.staticresources 1.4.2. Thank you both!