Remove redundant calls for mootools

As most of the javascript is now based on jQuery some calls to load mootools framework are redundant.
This is a response to #4473
This PR removes it from 
> formvalidate  https://github.com/joomla/joomla-cms/blob/staging/libraries/cms/html/behavior.php#L151
> combobox https://github.com/joomla/joomla-cms/blob/staging/libraries/cms/html/behavior.php#L215
> tooltip https://github.com/joomla/joomla-cms/blob/staging/libraries/cms/html/behavior.php#L257
> modal https://github.com/joomla/joomla-cms/blob/staging/libraries/cms/html/behavior.php#L326
> noframes https://github.com/joomla/joomla-cms/blob/staging/libraries/cms/html/behavior.php#L701

The only case I left the moo tools framework is for tree.

B/C
Shouldn’t break something, as the scripts are NOT moo tools dependent. 

Test
Try different navigation on a site (admin will be easier) and check that form validate, compobox, tooltip, modal and noframes still function as usual. Please check 3PD code with this, let’s NOT break things here!!!