Messages: Searchbar overlap

[dan-iway]

If there are enough messages the searchbar overlaps the last message.

I think this: https://github.com/maximebf/php-debugbar/blob/master/src/DebugBar/Resources/widgets.css#L23

Should be ul instead of div, so: div.phpdebugbar-widgets-messages ul.phpdebugbar-widgets-list {