fix(core): add missing display_refresh calls in TT UI

[no changelog]

core/embed/rust/src/ui/model_tt/bootloader/mod.rs

@@ -80,6 +80,7 @@ where
     fadeout();
     display::sync();
     frame.paint();
+    display::refresh();
     fadein();
 
     loop {
@@ -264,6 +265,8 @@ fn screen_progress(
     if initialize {
         fadein();
     }
+
+    display::refresh();
 }
 
 #[no_mangle]
@@ -340,6 +343,7 @@ extern "C" fn screen_boot_empty(fading: bool) {
     } else {
         display::set_backlight(BACKLIGHT_NORMAL);
     }
+    display::refresh();
 }
 
 #[no_mangle]

core/embed/rust/src/ui/model_tt/layout.rs

@@ -1588,6 +1588,7 @@ extern "C" fn draw_welcome_screen() -> Obj {
     screen.place(constant::screen());
     display::sync();
     screen.paint();
+    display::refresh();
     display::set_backlight(theme::BACKLIGHT_NORMAL);
     Obj::const_none()
 }