pcbnew: show clearance when move or drag via

pcbnew/class_track.cpp

@@ -874,8 +874,10 @@ void SEGVIA::Draw( EDA_DRAW_PANEL* panel, wxDC* DC, int draw_mode, const wxPoint
         }
     }
 
-    if( DisplayOpt.ShowTrackClearanceMode == SHOW_CLEARANCE_ALWAYS )
+    if( ShowClearance( this ) )
+    {
         GRCircle( panel->GetClipBox(), DC, m_Start + aOffset, radius + GetClearance(), 0, color );
+    }
 
     // for Micro Vias, draw a partial cross : X on component layer, or + on copper layer
     // (so we can see 2 superimposed microvias ):