Remove unused schematic settings filed

It was never written to the file and never used.

eeschema/dialogs/panel_setup_formatting.cpp

@@ -137,9 +137,6 @@ bool PANEL_SETUP_FORMATTING::TransferDataFromWindow()
             currJunctionDotSize = 1;
         }
 
-        settings.m_JunctionSizeMult =
-                projSettings->m_Drawing.junction_size_mult_list[currDotSizeIndex];
-
         settings.m_JunctionSizeChoice = currDotSizeIndex; // Store to set pulldown next time
     }
 

eeschema/schematic_settings.h

@@ -51,7 +51,6 @@ public:
     int       m_JunctionSize; // Size of junction dot in mils
     // User choice for junction dot size ( e.g. none = 0, smallest = 1, small = 2, etc )
     int       m_JunctionSizeChoice;
-    double    m_JunctionSizeMult; // junction dot size = this value * default line width
 
     bool      m_IntersheetsRefShow;
     bool      m_IntersheetsRefFormatShort;