Temporarily work around buggy zone refresh behavior

The actual problem is that EVENTS::SelectedItemsModified (via EDA_DRAW_FRAME::UpdateMsgPanel) is being called on every OnModify call, where it really should only be called if the *selected* items are modified.  This problem will take longer to fix.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/13279

pcbnew/widgets/pcb_properties_panel.cpp

@@ -93,7 +93,7 @@ void PCB_PROPERTIES_PANEL::AfterCommit()
 
         PROPERTY_BASE* property = m_propMgr.GetProperty( TYPE_HASH( *firstItem ),
                                                          pgProp->GetName() );
-        wxASSERT( property );
+        wxCHECK2( property, continue );
 
         bool writeable = true;