[modular] Clear out indexed components

Test=Builds fine.

Change-Id: I0b3ad639d35d99a52479354e257de62e6eb4ee08
diff --git a/BUILD.gn b/BUILD.gn
index 9e5a242..013c104 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -20,10 +20,9 @@
 }
 
 # This target, if included in the built image, will cause the listed module
-# packages (which must also be included in the built image) to have their
-# manifests indexed by the on-device module resolver when the user logs in.
+# components to have their module facets indexed by the on-device module resolver
+# when the user logs in. These indexed module facets will be used to resolve
+# implicit intents (i.e., intents without a 'handler' specified).
 initial_module_packages("topaz_modules_index") {
-  packages = [
-    "image",
-  ]
+  packages = []
 }