fix(core/bootloader): add fade-out before jumping to FW if backlight will be reset

[no changelog]

Author: TychoVrahe

core/embed/projects/bootloader/main.c

@@ -377,6 +377,10 @@ void real_jump_to_firmware(void) {
     ui_screen_boot_stage_1(false);
   }
 
+  if (DISPLAY_JUMP_BEHAVIOR == DISPLAY_RESET_CONTENT) {
+    display_fade(display_get_backlight(), 0, 200);
+  }
+
   drivers_deinit();
 
   system_deinit();