Fix "check all" checkbox for tables loaded via ajax

[escopecz]

Please be sure you are submitting this against the staging branch.

Q	A
Bug fix?	Y
New feature?	N
Automated tests included?	N
Related user documentation PR URL	/
Related developer documentation PR URL	/
Issues addressed (#s or URLs)	/
BC breaks?	N
Deprecations?	N

Description:

This issue this PR is fixing happens when the table is loaded via AJAX in a tab. In this scenario the target is null and later it will find all parentsUntil(null) which means all and removes the active class from them. Normally, there is no harm in that, but tabs use active class too and when removed the content disappears.

The solution I suggest is to read the target on change event. Not only on load which is useless for content loaded asynchronously.

Steps to reproduce the bug:

1. A plugin is needed for this. But code-review will do.

Steps to test this PR:

1. Make sure that selecting and unselecting all checkboxes on a table still works.