Added tooltips to simple state buttons in grid views (com_banners, com_installer)



Same as https://github.com/joomla/joomla-cms/pull/1335 but then for com_banners and com_installer

![e6e40d96-dc43-11e2-91d0-9d4ca7ebe435](https://f.cloud.github.com/assets/744259/694845/00de33ca-dcbc-11e2-8c1a-d4b92e389baa.png)

### Testing Instructions
Check all the grid views with simple state buttons (list views of Banners an Extension Manager) to see if the tooltips is added to the state buttons.