Remove unused generic in DeferredWorld::trigger (#16911)

Fixing what I just noticed.

## Migration Guide

- Remove the generic parameter when calling this method

crates/bevy_ecs/src/world/deferred_world.rs

@@ -562,7 +562,7 @@ impl<'w> DeferredWorld<'w> {
     }
 
     /// Sends a "global" [`Trigger`](crate::observer::Trigger) without any targets.
-    pub fn trigger<T: Event>(&mut self, trigger: impl Event) {
+    pub fn trigger(&mut self, trigger: impl Event) {
         self.commands().trigger(trigger);
     }