refactor: Use 2-arity for on_script_reloaded().

Two arguments every time. The second argument may be Unit/nil.

Author: shanecelis

crates/bevy_mod_scripting_core/src/commands.rs

@@ -200,7 +200,7 @@ impl<P: IntoScriptPluginParams> Command for CreateOrUpdateScript<P> {
                                 &OnScriptReloaded::into_callback_label(),
                                 &self.id,
                                 Entity::from_raw(0),
-                                vec![ScriptValue::Bool(true)],
+                                vec![ScriptValue::Bool(true), ScriptValue::Unit],
                                 guard.clone(),
                             ) {
                                 Ok(state) => {
@@ -226,7 +226,7 @@ impl<P: IntoScriptPluginParams> Command for CreateOrUpdateScript<P> {
                             &OnScriptReloaded::into_callback_label(),
                             &self.id,
                             Entity::from_raw(0),
-                            vec![ScriptValue::Bool(true)],
+                            vec![ScriptValue::Bool(true), ScriptValue::Unit],
                             guard.clone(),
                         ) {
                             Ok(state) => {