[GUI] send widget, hide contacts menu when clear event is triggered. #2161
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Fixing crash reported in #2160 .
Inside the send screen the "clear all" event removes every row and there by every entry from the widget, as the contacts menu stores a local pointer to the entry where is being open and the data being pointed does't exist anymore, it was occasioning a crash there.
The solution is simple, close the menu contacts when the clear button is pressed.