Fix breakage: bad path join using '/' literal

Typo in filename s/b NOTICE.html.gz not NOTICES.html.gz

Bug: 227682036

Test: TARGET_BUILD_VARIANT=userdebug UNBUNDLED_BUILD_SDKS_FROM_SOURCE=true vendor/google/build/mainline_modules_bundles.sh -j97

Change-Id: I75cc28e3ef22d975ad46f4e167071f6d82ba253d
diff --git a/apex/builder.go b/apex/builder.go
index 5d5d1ab..50c8dd1 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -617,7 +617,7 @@
 		}
 
 		// Create a NOTICE file, and embed it as an asset file in the APEX.
-		a.htmlGzNotice = android.PathForModuleOut(ctx, "NOTICE/NOTICES.html.gz")
+		a.htmlGzNotice = android.PathForModuleOut(ctx, "NOTICE", "NOTICE.html.gz")
 		android.BuildNoticeHtmlOutputFromLicenseMetadata(ctx, a.htmlGzNotice)
 		implicitInputs = append(implicitInputs, a.htmlGzNotice)
 		optFlags = append(optFlags, "--assets_dir "+filepath.Dir(a.htmlGzNotice.String()))