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gui: fix crash on selecting "Mask values" in transaction view
This commits fixes a crash bug that can be caused with the following steps: - change to the "Transactions" view - right-click on an arbitrary transaction -> "Show transaction details" - close the transaction detail window again - select "Settings" -> "Mask values" The problem is that the list of opened dialogs, tracked in the member variable `m_opened_dialogs`, is only ever appended with newly opened transaction detail dialog pointers, but never removed. This leads to dangling pointers in the list, and if the "Mask values" menu item is selected, a crash is caused in the course of trying to close the opened transaction detail dialogs (see `closeOpenedDialogs()` method). Fix this by removing a pointer of the list if the corresponding widget is destroyed.
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