do not apply modulate on canvas when unshaded is set

servers/rendering/renderer_rd/shaders/canvas.glsl

@@ -597,7 +597,7 @@ void main() {
 
 #ifdef MODE_LIGHT_ONLY
 	color = vec4(0.0);
-#else
+#elif !defined(MODE_UNSHADED)
 	color *= canvas_data.canvas_modulation;
 #endif