fix black as alpha in ui simulator

extmod/modtrezorui/display-unix.h

@@ -95,6 +95,8 @@ void display_init(void)
     SDL_RenderClear(RENDERER);
     SCREEN = SDL_CreateRGBSurface(0, RESX, RESY, 16, 0xF800, 0x07E0, 0x001F, 0x0000);
     TEXTURE = SDL_CreateTexture(RENDERER, SDL_PIXELFORMAT_RGB565, SDL_TEXTUREACCESS_STREAMING, RESX, RESY);
+    SDL_SetTextureBlendMode(TEXTURE, SDL_BLENDMODE_NONE);
+    SDL_SetTextureAlphaMod(TEXTURE, 0);
 }
 
 void display_set_window(uint16_t x, uint16_t y, uint16_t w, uint16_t h)

vendor/micropython

@@ -1 +1 @@
-Subproject commit a15a57d3740b7b63433247514eab2089f2a5d0ac
+Subproject commit 3dd71afa643f0191d55383adbe0501a6bac32c6a