Remove 'static requirement on run

There's no need to force the static on the users, given that internally
some backends were not using static in the first place.

Co-authored-by: daxpedda <daxpedda@gmail.com>

src/platform_impl/android/mod.rs

@@ -526,8 +526,7 @@ impl<T: 'static> EventLoop<T> {
 
     pub fn run<F>(mut self, event_handler: F) -> Result<(), RunLoopError>
     where
-        F: 'static
-            + FnMut(event::Event<T>, &event_loop::EventLoopWindowTarget<T>, &mut ControlFlow),
+        F: FnMut(event::Event<T>, &event_loop::EventLoopWindowTarget<T>, &mut ControlFlow),
     {
         self.run_ondemand(event_handler)
     }