ENH:optimize the logic of the IP input window

jira:[STUDIO-10375 STUDIO-10534]

Change-Id: I75ff12403dbf8f59fa95c938fa97ec2497f0ed67
(cherry picked from commit b62efed65f26b1ea4390c2d1e8681169e63fff99)

src/slic3r/GUI/BBLStatusBarSend.hpp

@@ -86,6 +86,9 @@ public:
 
     void disable_cancel_button();
     void enable_cancel_button();
+
+    void    cancel();
+
 private:
     bool     m_show_error_info_state = false;
     bool     m_busy = false;