HexEditor: Only mark window as modified when document is actually dirty

Author: https://github.com/nbvdkamp 🔰
Commit: 24f729d0ef
Pull-request: https://github.com/SerenityOS/serenity/pull/15160
Reviewed-by: https://github.com/linusg

Userland/Applications/HexEditor/HexEditor.cpp

@@ -518,7 +518,7 @@ void HexEditor::update_status()
 void HexEditor::did_change()
 {
     if (on_change)
-        on_change();
+        on_change(m_document->is_dirty());
 }
 
 void HexEditor::paint_event(GUI::PaintEvent& event)