Fix end of match being able to alter state even after the match has finished

src/schedule.rs

@@ -9,6 +9,8 @@
 use bevy::prelude::*;
 use bevy_ggrs::prelude::*;
 
+use crate::match_runtime::match_is_ongoing;
+
 #[derive(SystemSet, Debug, Clone, PartialEq, Eq, Hash)]
 pub enum GameplaySet {
     /// Turn this frame's netcode inputs into per-fighter input state.
@@ -47,7 +49,8 @@ impl Plugin for GameplaySchedulePlugin {
                 GameplaySet::Attacks,
                 GameplaySet::MatchRules,
             )
-                .chain(),
+                .chain()
+                .run_if(match_is_ongoing),
         );
     }
 }