Xwayland: Disable input spy on xwayland teardown

Otherwise we have a potential crash when we send keys to the
non-existent xwayland wayland connection

src/xwayland/xwayland.cpp

@@ -282,6 +282,9 @@ void Xwayland::handleXwaylandFinished()
     m_dataBridge.reset();
     m_selectionOwner.reset();
 
+    m_inputSpy.reset();
+    disconnect(options, &Options::xwaylandEavesdropsChanged, this, &Xwayland::refreshEavesdropping);
+
     destroyX11Connection();
 }