Show full component class string in pcb properties panel

Currently, the human-readable component class is shown in the info
bar. For multiple component classes, this means that not all will
be readable. Showing the formal ordered string in the properties
panel mitigates this issue.

pcbnew/footprint.cpp

@@ -4076,12 +4076,11 @@ static struct FOOTPRINT_DESC
                     NO_SETTER( FOOTPRINT, wxString ), &FOOTPRINT::GetKeywords ),
                     groupFields );
 
-        // Used only in DRC engine
+        // Note: Also used by DRC engine
         propMgr.AddProperty( new PROPERTY<FOOTPRINT, wxString>(
                                      _HKI( "Component Class" ), NO_SETTER( FOOTPRINT, wxString ),
-                                     &FOOTPRINT::GetComponentClassAsString ) )
-                .SetIsHiddenFromLibraryEditors()
-                .SetIsHiddenFromPropertiesManager();
+                                     &FOOTPRINT::GetComponentClassAsString ), groupFields )
+                .SetIsHiddenFromLibraryEditors();
 
         const wxString groupAttributes = _HKI( "Attributes" );