Rename app_init to android_init

cargo-iris/tests/fixture/src/lib.rs

@@ -10,7 +10,7 @@ impl AndroidAppState for State {
     type Resources = Resources;
 }
 
-#[iris::app_init]
+#[iris::android_init]
 fn create(mut ui_state: AndroidUiState, rsc: &mut Resources) -> State {
     rsc.launches += 1;
     rect(PaintId::RED)