GODT-1837: Fix restart.

GOTD-1837: added wait flag.
GODT-1837: strip --wait flag from launcher command-line.
GODT-1837: hide main window before restart.

internal/frontend/bridge-gui/bridge-gui/qml/Bridge.qml

@@ -59,6 +59,10 @@ QtObject {
                 mainWindow.showAndRise()
             }
             function onColorSchemeNameChanged(scheme) { root.setColorScheme() }
+
+            function onHideMainWindow() {
+                mainWindow.hide();
+            }
         }
     }