[rekonq] correctly return from fullscreen mode

[Ronny Scholz]

Rekonq stores visibility information of panels and toolbars if it enters 
fullscreen mode. This information is used when leaving fullscreen mode to 
decide which elements need to be made visible again.

However, rekonq overwrites this visibility information if the mouse is moved 
during fullscreen mode. The result is that some gui elements are not made 
visible again after fullscreen mode is left, e.g. the bookmarks toolbar.

The attached patch fixes this issue. It ensures that visibility of elements is 
only updated in windowed mode.
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