Update WW metric enums for soon-to-be-added prompt templates.

Bug: 295238371
Test: N/A (only adding enums, unused)
Change-Id: Idd65509590dad77f5514a6316e442b3320a48235
diff --git a/stats/atoms/aiwallpapers/aiwallpapers_extension_atoms.proto b/stats/atoms/aiwallpapers/aiwallpapers_extension_atoms.proto
index faf36d4..1843273 100644
--- a/stats/atoms/aiwallpapers/aiwallpapers_extension_atoms.proto
+++ b/stats/atoms/aiwallpapers/aiwallpapers_extension_atoms.proto
@@ -73,6 +73,10 @@
   PROMPT_UNEXPECTED_LANDSCAPE = 17;
   PROMPT_VIVID = 18;
   PROMPT_PATTERN = 19;
+  PROMPT_AIRBRUSH_FLOWERS = 20;
+  PROMPT_SPIRITUAL = 21;
+  PROMPT_CURIOUS_WORLD = 22;
+  PROMPT_SCAN = 23;
 }