Don't add footprint components to PCB group

Footprint components are only group-able inside of the footprint editor

Fixes https://gitlab.com/kicad/code/kicad/issues/13396

pcbnew/dialogs/dialog_group_properties.cpp

@@ -147,6 +147,7 @@ void DIALOG_GROUP_PROPERTIES::OnAddMember( wxCommandEvent& event )
 
 void DIALOG_GROUP_PROPERTIES::DoAddMember( EDA_ITEM* aItem )
 {
+
     for( size_t ii = 0; ii < m_membersList->GetCount(); ++ii )
     {
         if( aItem == static_cast<BOARD_ITEM*>( m_membersList->GetClientData( ii ) ) )

pcbnew/tools/group_tool.cpp

@@ -161,7 +161,15 @@ int GROUP_TOOL::PickNewMember( const TOOL_EVENT& aEvent  )
 
                 if( m_propertiesDialog )
                 {
-                    m_propertiesDialog->DoAddMember( sel.Front() );
+                    EDA_ITEM* elem = sel.Front();
+
+                    if( !m_isFootprintEditor )
+                    {
+                        while( elem->GetParent() && elem->GetParent()->Type() != PCB_T )
+                            elem = elem->GetParent();
+                    }
+
+                    m_propertiesDialog->DoAddMember( elem );
                     m_propertiesDialog->Show( true );
                 }