Rebuild header on "Save as"

Fixes #5550

Author: facchinm

Diff for: app/src/processing/app/Editor.java

@@ -2106,6 +2106,7 @@ public boolean handleSaveAs() {
 
       // Update editor window title in case of "Save as..."
       updateTitle();
+      header.rebuild();
     }
 
     return true;