Reset the game options form when the game changes

The creation options were rendered as a keyed list, so a field shared by
two games (target_score) kept the previous game's widget when the game
changed: after switching scopone -> briscola the input still showed 11
with scopone's min/max instead of the briscola default 61 (1/100 instead
of 61/120), even though the submitted payload was already correct.

Recreate the option inputs on every game switch instead, so each one is
initialized from the new game's defaults and schema constraints.

web/src/pages/lobby.rs

@@ -671,13 +671,21 @@ pub fn LobbyPage() -> View {
                                                         div(class="mb-3") { (players_note) }
                                                     }
                                                 }))
-                                            Keyed(
-                                                list=fields,
-                                                view=move |f| view! {
-                                                    OptionInput(field=f.clone(), options=options)
-                                                },
-                                                key=|f| f.key.clone(),
-                                            )
+                                            // Recreate the option inputs on every
+                                            // game switch: keyed rendering kept
+                                            // the previous game's field (value,
+                                            // min/max) for shared keys such as
+                                            // target_score.
+                                            (move || {
+                                                let _game = selected_game.get_clone();
+                                                fields
+                                                    .get_clone()
+                                                    .into_iter()
+                                                    .map(|f| view! {
+                                                        OptionInput(field=f, options=options)
+                                                    })
+                                                    .collect::<Vec<_>>()
+                                            })
                                             button(
                                                 class="btn btn-warning btn-lg w-100 mt-auto",
                                                 on:click=on_create,