modedit: Allow wildcard footprint import

When importing footprints, some are generated with non-standard (e.g.
"mod") extensions.  As a last option, we allow the * wildcard to select
these files for import.

pcbnew/footprint_libraries_utils.cpp

@@ -104,7 +104,8 @@ static wxFileName getFootprintFilenameFromUser( wxWindow* aParent, const wxStrin
 
     wildCard << KiCadFootprintLibFileWildcard() << wxChar( '|' )
              << ModLegacyExportFileWildcard() << wxChar( '|' )
-             << GedaPcbFootprintLibFileWildcard();
+             << GedaPcbFootprintLibFileWildcard() << wxChar( '|' )
+             << AllFilesWildcard;
 
     wxFileDialog dlg( aParent, FMT_IMPORT_MODULE, aLastPath, wxEmptyString, wildCard,
             wxFD_OPEN | wxFD_FILE_MUST_EXIST );