Replace deprecated use of launch

It is now replaced by `launchUrl` or `launchUrlString`.

Author: DocMarty84

lib/common/tools.dart

@@ -3,11 +3,14 @@ import 'dart:io';
 import 'package:http/http.dart' as http;
 import 'package:path_provider/path_provider.dart';
 import 'package:permission_handler/permission_handler.dart';
-import 'package:url_launcher/url_launcher.dart';
+import 'package:url_launcher/url_launcher_string.dart';
 
 void launchURL(String url) async {
-  if (await canLaunch(url)) {
-    await launch(url);
+  if (await canLaunchUrlString(url)) {
+    await launchUrlString(
+      url,
+      mode: LaunchMode.externalApplication,
+    );
   } else {
     throw Exception('Could not launch $url');
   }