Pcbnew: remove SVG from menu text

The SVG importer is an advanced config. It's not supported or
normally available in 5.1, so don't advertise in the menu.

If the advanced config is enabled, the dialog will be able
to import SVG.

This could have been "Import *Vector* Graphics" like in master,
5.1 documentation will probably still say "DXF", so keep consistent.

Fixes: lp:1821571
* https://bugs.launchpad.net/kicad/+bug/1821571

pcbnew/menubar_footprint_editor.cpp

@@ -103,8 +103,8 @@ void FOOTPRINT_EDIT_FRAME::ReCreateMenuBar()
                  KiBitmap( import_module_xpm ) );
 
     AddMenuItem( fileMenu, ID_GEN_IMPORT_GRAPHICS_FILE,
-                 _( "Import Outlines from &DXF or SVG File..." ),
-                 _( "Import 2D Drawing DXF or SVG file to Footprint Editor on Drawings layer" ),
+                 _( "Import Outlines from &DXF File..." ),
+                 _( "Import 2D Drawing to Footprint Editor on Drawings layer" ),
                  KiBitmap( import_xpm ) );
 
     AddMenuItem( fileMenu, ID_MODEDIT_EXPORT_PART,