FIX: use dialog instead of popup window

jira: [STUDIO-10692]
Change-Id: I85e8da120946fc6ff845c9b88d4f1594e313652b
(cherry picked from commit 7115c1ca177e98c2931517d748ce4d63d3a067da)

src/slic3r/GUI/StatusPanel.cpp

@@ -4824,7 +4824,7 @@ void StatusPanel::on_nozzle_fan_switch(wxCommandEvent &event)
     }
 
     m_fan_control_popup->SetPosition(pos);
-    m_fan_control_popup->Popup();
+    m_fan_control_popup->ShowModal();