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/orbital/event_loop.rs

@@ -445,8 +445,7 @@ impl<T: 'static> EventLoop<T> {
 
     pub fn run<F>(mut self, mut event_handler_inner: 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),
     {
         // Wrapper for event handler function that prevents ExitWithCode from being unset.
         let mut event_handler =