Updated modals

Author: ReightI

lib/components/fields/app_field.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:piwigo_ng/utils/settings.dart';
 
 class AppField extends StatelessWidget {
   const AppField({
@@ -44,6 +45,9 @@ class AppField extends StatelessWidget {
   Widget build(BuildContext context) {
     return Container(
       margin: margin,
+      constraints: BoxConstraints(
+        maxWidth: Settings.modalMaxWidth,
+      ),
       decoration: BoxDecoration(
         borderRadius: BorderRadius.circular(10.0),
         color: color ?? Theme.of(context).inputDecorationTheme.fillColor,