Unify support for line width magic cookies.

They were added for the Gerber plotter but once there there's the
expectation by others that they'll work.

common/gr_text.cpp

@@ -233,6 +233,7 @@ void PLOTTER::Text( const wxPoint&              aPos,
                     void*                       aData )
 {
     SetColor( aColor );
+    SetCurrentLineWidth( aPenWidth );
 
     GRText( NULL, aPos, aColor, aText, aOrient, aSize, aH_justify, aV_justify, aPenWidth,
             aItalic, aBold, nullptr, nullptr, this );