#184 Exception in gamebrowser::resizing

[Fulvio]

gamebrowser: resizing not possible after a button is pressed (e.g. next or back).
The keys "+" or "-" throw an exception: can't read "::board::_size(.gb0.b.back.bd)": no such element
in array.
https://sourceforge.net/p/scid/code/ci/master/tree/tcl/windows/browser.tcl#l58