use the same name format when deleting users

server.js

@@ -473,10 +473,7 @@ io.on('connection', function (socket) {
       const toBeDeleted = [];
       let nb_delete = 0;
       for (let name of options) {
-        if (!name.startsWith(socket.user.name + '_')) {
-          socket.emit('sudo-error', 'you are not allowed to delete user ' + name);
-          return;
-        }
+        name = socket.user.name + '_' + name;
         toBeDeleted.push(name);
         let user = await db.Users.get({ username: name });
         if (user) {
@@ -489,6 +486,7 @@ io.on('connection', function (socket) {
           socket.emit('sudo-result', 'deletion cancelled');
           return;
         }
+        names_check = names_check.map(n => socket.user.name + '_' + n);
         // check if the names are the same
         for (let name of names_check) {
           if (!toBeDeleted.includes(name)) {