system/ui: Improve UI rendering smoothness for scaled display (#35280)

improve smoothness

system/ui/lib/application.py

@@ -72,6 +72,7 @@ class GuiApplication:
     if self._scale != 1.0:
       rl.set_mouse_scale(1 / self._scale, 1 / self._scale)
       self._render_texture = rl.load_render_texture(self._width, self._height)
+      rl.set_texture_filter(self._render_texture.texture, rl.TextureFilter.TEXTURE_FILTER_BILINEAR)
     rl.set_target_fps(fps)
 
     self._target_fps = fps