Update tags.json

Add GTAO tag for WebGPU AO demo.

examples/tags.json

@@ -145,7 +145,7 @@
 	"webgpu_particles": [ "fire" ],
 	"webgpu_postprocessing_3dlut": [ "color grading" ],
 	"webgpu_postprocessing_afterimage": [ "trails" ],
-	"webgpu_postprocessing_ao": [ "ambient occlusion", "mrt" ],
+	"webgpu_postprocessing_ao": [ "ambient occlusion", "mrt", "gtao" ],
 	"webgpu_postprocessing_bloom": [ "glow", "mrt" ],
 	"webgpu_postprocessing_bloom_emissive": [ "glow", "mrt" ],
 	"webgpu_postprocessing_bloom_selective": [ "glow", "mrt" ],