FIX:Fix the crashes when users import 3MF files that use third-party printers.

Jira:STUDIO-13586

Change-Id: I977e9e426e2f2b98da389e7bfa8fb57388c55628
(cherry picked from commit 9d170ebd52a94579a81a9e8bc8eb19ae27ba3076)

src/slic3r/GUI/PhysicalPrinterDialog.hpp

@@ -69,6 +69,7 @@ public:
 protected:
     void on_dpi_changed(const wxRect& suggested_rect) override;
     void on_sys_color_changed() override {};
+    void check_host_key_valid();
 };