Remove stale when updated without comment

The existing logic for `remove-stale-when-updated` only considers presence of
comments, ignoring the value of `issueHasUpdate`.

This commits fixes it so it follows the documented behaviour for that setting.

Fixes #715

src/classes/issues-processor.ts

@@ -667,9 +667,9 @@ export class IssuesProcessor {
     }
 
     // Should we un-stale this issue?
-    if (shouldRemoveStaleWhenUpdated && issueHasComments) {
+    if (shouldRemoveStaleWhenUpdated && (issueHasUpdate || issueHasComments)) {
       issueLogger.info(
-        `Remove the stale label since the $$type has a comment and the workflow should remove the stale label when updated`
+        `Remove the stale label since the $$type has been updated and the workflow should remove the stale label when updated`
       );
       await this._removeStaleLabel(issue, staleLabel);