Fix too-aggressive shortcut

Change-Id: I3cb96581cf50d8be620d6976b48576febc401f2f
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.js b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.js
index fd54af4..5a56069 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.js
@@ -1040,6 +1040,7 @@
     },
 
     _handleNextUnreviewedFile(e) {
+      if (this.shouldSuppressKeyboardShortcut(e)) { return; }
       this._setReviewed(true);
       // Ensure that the currently viewed file always appears in unreviewedFiles
       // so we resolve the right "next" file.