[rekonq] display ampersands correctly

[Ronny Scholz]

Rekonq's tabs are not able to show text with ampersands. Same applies to the 
bookmark toolbar. The reason is that ampersands are used in Qt to specify 
accelerator keys and therefore are removed from the visible text, leaving the 
following character underlined.

The attached patch works around this by writing "&&" to tab texts and bookmark 
texts instead of plain "&". This fixes bug 
https://bugs.kde.org/show_bug.cgi?id=235001
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