remove location from named elements

src/main/java/org/jastadd/tooling/grammar/psi/impl/GrammarNamedElementImpl.java

@@ -38,11 +38,6 @@ public abstract class GrammarNamedElementImpl extends ASTWrapperPsiElement imple
         return getName();
       }
 
-      @Override
-      public String getLocationString() {
-        return getContainingFile().getName();
-      }
-
       @Override
       public Icon getIcon(boolean unused) {
         return JastAddIcons.FILE;