[rekonq] don't focus tab on middle mouse click

[Ronny Scholz]

This is a fix for bug https://bugs.kde.org/show_bug.cgi?id=205902

The problem is that the click event of the middle mouse button onto a tab 
activates it. Therefore, if a tab in the background is closed, the currently 
activated tab looses the focus.

With the attached patch, rekonq won't focus a tab on middle mouse click.
However, we will also loose the possibility to move tabs with the middle mouse 
button (left button still works though), so this fix may need some discussion.
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