zephyr: embassy: executor: Remove duplicated use lines

Earlier merge error duplicated these.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

zephyr/src/embassy/executor.rs

@@ -3,11 +3,8 @@
 use core::marker::PhantomData;
 
 use crate::sys::sync::Semaphore;
-use crate::sys::sync::Semaphore;
-use crate::time::Forever;
 use crate::time::Forever;
 use embassy_executor::{raw, Spawner};
-use embassy_executor::{raw, Spawner};
 
 /// Zephyr-thread based executor.
 pub struct Executor {