Fix errors when hovering over the action column header

[theboxer]

What does it do?

ExtJS is grabbing the header by regex on class 'x-grid3-td-([^\\s]+)', for some reason the class for action column header doesn't populate correctly (when using column model). Manually specifying an id fixes the issue.

Why is it needed?

Get rid of the errors

How to test

Open system settings & console. hover over the action column header.

[Mark-H]

Probably worth double checking on pages with more than one grid.

[smg6511]

Probably worth double checking on pages with more than one grid.

I double-checked this in the one area that has multiple grids that include an actions column (the ACLs) and all works as expected.

[opengeek]

I was unable to apply this to 3.0.x. If we want this fix on 3.0.x, I'll need the relevant changes submitted against that branch directly.