FIX: hide fan when device not in fdm

JIRA: none

Change-Id: I14a6e01b4e0950ca1bc3c805fe00313cfd7caf06
(cherry picked from commit c12b4f13911a7f6057eced54dba9e41cf75985ea)

src/slic3r/GUI/DeviceManager.hpp

@@ -1027,6 +1027,9 @@ public:
 
     bool is_makeworld_subtask();
 
+    /* device type */
+    bool        is_fdm{ true };
+    inline bool is_fdm_type() const { return is_fdm; }
 
     int m_plate_index { -1 };
     std::string m_gcode_file;