common: Change semantics of UNREACHABLE to unconditionally crash

src/yuzu/applets/qt_controller.cpp

@@ -631,7 +631,7 @@ void QtControllerSelectorDialog::DisableUnsupportedPlayers() {
     switch (max_supported_players) {
     case 0:
     default:
-        UNREACHABLE();
+        ASSERT(false);
         return;
     case 1:
         ui->widgetSpacer->hide();