Fix height calculation for preferred filament area height (#12660)

## FIXES
• Corrects area height on windows while using 125% and 175% scaling. it
shows scrollbar when it incorrectly set. i have used directly size of
combobox this time instead static number

## IMPROVEMENTS
• Removes restriction for restarting orca when setting changed

src/slic3r/GUI/Preferences.hpp

@@ -63,6 +63,7 @@ public:
     ~PreferencesDialog();
 
     wxString m_backup_interval_time;
+    wxTimer m_filament_height_timer;
 
     void      create();
 
@@ -109,6 +110,8 @@ public:
     void create_shortcuts_page();
     wxBoxSizer* create_debug_page();
 
+    void UpdateSidebarLayout();
+
     // BBS
     void create_select_domain_widget();