debug_server: make crash dialog button default

Change-Id: If05f775fe919445b3e18d356a9837fdb6fabf5cf
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2063
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

src/servers/debug/DebugWindow.cpp

@@ -73,6 +73,7 @@ DebugWindow::DebugWindow(const char* appName)
 
 	fOKButton = new BButton("close", B_TRANSLATE("Oh no!"),
 		new BMessage(B_QUIT_REQUESTED));
+	fOKButton->MakeDefault(true);
 
 	terminate->SetValue(B_CONTROL_ON);