add dispose to files to remove controllers when not used

Frontend/patient_manager/lib/components/inputsAndButtons/mihMLTextInput.dart

@@ -77,6 +77,12 @@ class _MIHMLTextFieldState extends State<MIHMLTextField> {
     }
   }
 
+  @override
+  void dispose() {
+    _focus.dispose();
+    super.dispose();
+  }
+
   @override
   void initState() {
     _focus.addListener(_onFocusChange);