Changed tooltip html behavior back to pre-bootstrap 2.3.2 (so default on)

The new Bootstrap 2.3.2 uses plain text instead of html to show the tooltips by default.
This however causes all current tooltips in Joomla that use html to display the html tags.
It is more practical for Joomla for the Tooltips feature to use the html behavior by default.

#### Testing instructions
Create a tooltip on an element that contains html tags, like:
```<span class="hasTooltip" title="<strong>TEST</strong>">Testing</span>```
Test tooltip with current master before and after this fix.