add dispose to files to remove controllers when not used

Frontend/patient_manager/lib/components/mihAppDrawer.dart

@@ -46,6 +46,12 @@ class _MIHAppDrawerState extends State<MIHAppDrawer> {
     return true;
   }
 
+  @override
+  void dispose() {
+    // TODO: implement dispose
+    super.dispose();
+  }
+
   @override
   void initState() {
     //signedInUser = getUserDetails();