add dispose to files to remove controllers when not used

Frontend/patient_manager/lib/components/patientNotes.dart

@@ -272,6 +272,13 @@ class _PatientNotesState extends State<PatientNotes> {
     }
   }
 
+  @override
+  void dispose() {
+    titleController.dispose();
+    noteTextController.dispose();
+    super.dispose();
+  }
+
   @override
   void initState() {
     futueNotes = fetchNotes(endpoint + widget.patientAppId);