fixup! feat(core/rust): homescreen background

core/embed/rust/src/micropython/gc.rs

@@ -1,6 +1,6 @@
 use core::{
     alloc::Layout,
-    ops::{Deref, DerefMut},
+    ops::Deref,
     ptr::{self, NonNull},
 };
 
@@ -109,9 +109,3 @@ impl<T: ?Sized> Deref for Gc<T> {
         unsafe { self.0.as_ref() }
     }
 }
-
-impl<T: ?Sized> DerefMut for Gc<T> {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        unsafe { self.0.as_mut() }
-    }
-}

core/embed/rust/src/ui/model_tt/component/homescreen/mod.rs

@@ -307,12 +307,13 @@ fn get_image() -> Result<Gc<[u8]>, ()> {
     if let Ok(len) = get_avatar_len() {
         let result = Gc::<[u8]>::new_slice(len);
         if let Ok(mut buffer) = result {
-            if get_avatar(buffer.as_mut()).is_ok() {
+            let buf = unsafe { Gc::<[u8]>::as_mut(&mut buffer) };
+            if get_avatar(buf).is_ok() {
                 let toif = toif_info(buffer.as_ref());
                 if let Some((size, format)) = toif {
                     if size.x == HOMESCREEN_IMAGE_SIZE
                         && size.y == HOMESCREEN_IMAGE_SIZE
-                        && format == ToifFormat::FullColorLE
+                        && format == ToifFormat::FullColorBE
                     {
                         return Ok(buffer);
                     }