iui: ffi: replace ATOMIC_BOOL_INIT with AtomicBool::new()

The constant ATOMIC_BOOL_INIT was deprecated when const fn support was
added, because `AtomicBool::new()` can now be used.  Replace this
constant with the function call in order to remove a deprecated warning.

Signed-off-by: Sean Cross <[email protected]>

Author: xobs

iui/src/ffi_tools.rs

@@ -1,7 +1,7 @@
 //! Utilities to manage the state of the interface to the libUI bindings.
-use std::sync::atomic::{AtomicBool, Ordering, ATOMIC_BOOL_INIT};
+use std::sync::atomic::{AtomicBool, Ordering};
 
-static INITIALIZED: AtomicBool = ATOMIC_BOOL_INIT;
+static INITIALIZED: AtomicBool = AtomicBool::new(false);
 
 /// Set the global flag stating that libUI is initialized.
 ///