Fix ui painter colored texture rendering

libs/ui/source/painter_impl.cpp

@@ -118,7 +118,8 @@ out vec4 out_color;
 
 void main()
 {
-	out_color = mix(texture(u_texture, texcoord), color, color.a);
+	vec4 tex_color = texture(u_texture, texcoord);
+	out_color = vec4(mix(tex_color.rgb, color.rgb, color.a), tex_color.a);
 }
 )";