build: clear 54 warnings - dead private fields (#15423)

build: clear 54 dead private fields

54 of the 161 -Wunused-private-field warnings, across 31 files. These are
the ones needing no judgment. Each member is declared once and appears
nowhere else in src/, counting the .mm and .c sources as well as .cpp and
.hpp, so nothing writes them and nothing reads them. Every removal is a
whole line, and no declaration shares a line with another member.

The remaining 107 are left alone. Those members are mentioned elsewhere,
usually assigned and never read, where the fix might be deleting the
member or might be restoring a read that went missing.

src/slic3r/GUI/Widgets/AMSItem.hpp

@@ -684,7 +684,6 @@ public:
 
 private:
     int             m_nozzle_num           = {1};
-    AMSRoadShowMode m_single_ext_rode_mode = {AMSRoadShowMode::AMS_ROAD_MODE_FOUR};
     AMSRoadShowMode m_left_rode_mode       = {AMSRoadShowMode::AMS_ROAD_MODE_FOUR};
     AMSRoadShowMode m_right_rode_mode      = {AMSRoadShowMode::AMS_ROAD_MODE_FOUR};
     bool            m_selected             = {false};
@@ -693,7 +692,6 @@ private:
     int             m_right_road_length    = {-1};
     int             m_passroad_width       = {6};
     double          m_radius               = {4};
-    AMSPassRoadType m_pass_road_type       = {AMSPassRoadType::AMS_ROAD_TYPE_NONE};
     AMSPassRoadSTEP m_pass_road_left_step  = {AMSPassRoadSTEP::AMS_ROAD_STEP_NONE};
     AMSPassRoadSTEP m_pass_road_right_step = {AMSPassRoadSTEP::AMS_ROAD_STEP_NONE};
 
@@ -866,11 +864,7 @@ private:
     AMSinfo         m_info;
     wxBoxSizer *    sizer_can = {nullptr};
     wxGridSizer*    sizer_can_extra = { nullptr };
-    wxBoxSizer *    sizer_humidity = { nullptr };
     wxBoxSizer *    sizer_item = { nullptr };
-    wxBoxSizer *    sizer_can_middle = {nullptr};
-    wxBoxSizer *    sizer_can_left = {nullptr};
-    wxBoxSizer *    sizer_can_right = {nullptr};
     AMSExtImage*    m_ext_image = { nullptr };      //the ext image upon the ext ams
     AMSExtText* m_ext_text = { nullptr };       //the ext text upon the ext ams
 };