Only get 3D viewer colors when launched from the PCb editor

When launched from CVPCB or the footprint editor/viewer the stackup
isn't user-editable, so it just gives its default colors.

3d-viewer/3d_rendering/3d_render_raytracing/c3d_render_createscene.cpp

@@ -677,11 +677,12 @@ void C3D_RENDER_RAYTRACING::reload( REPORTER *aStatusTextReporter )
 
             SFVEC3F layerColor;
             if( m_settings.GetFlag( FL_USE_REALISTIC_MODE ) )
-
+            {
                 if( layer_id == B_Mask )
                     layerColor = m_settings.m_SolderMaskColorBot;
                 else
                     layerColor = m_settings.m_SolderMaskColorTop;
+            }
             else
                 layerColor = m_settings.GetLayerColor( layer_id );
 

3d-viewer/3d_viewer/3d_menubar.cpp

@@ -308,8 +308,12 @@ void EDA_3D_VIEWER::CreateMenuBar()
     colorSubmenu->AddItem( ID_MENU3D_PCB_BODY_COLOR, _( "Board Body Color..." ), "",
                            setcolor_board_body_xpm,            SELECTION_CONDITIONS::ShowAlways );
 
-    colorSubmenu->AddItem( ID_MENU3D_STACKUP_COLORS, _( "Get colors from physical stackup" ), "",
-            nullptr, SELECTION_CONDITIONS::ShowAlways );
+    // Only allow the stackup to be used in the PCB editor, since it isn't editable in the other frames
+    if( Parent()->IsType( FRAME_PCB_EDITOR ) )
+    {
+        colorSubmenu->AddItem( ID_MENU3D_STACKUP_COLORS, _( "Get colors from physical stackup" ), "",
+                nullptr, SELECTION_CONDITIONS::ShowAlways );
+    }
 
     prefsMenu->AddMenu( colorSubmenu );