Revert "try to exclude showcase from generation:"

This reverts commit fc49808.

Author: diegomarquezp

generation_config.yaml

@@ -3,15 +3,15 @@ googleapis_commitish: 6942862f40d7a65b8e65ec491605d90d48458eaa
 # java-{library.library_name} or java-{library.api-shortname} when
 # library.library_name is not defined.
 libraries:
-#- api_shortname: showcase
-#  excluded_poms: gapic-showcase-bom
-#  name_pretty: Showcase
-#  api_description: Showcase module
-#  product_documentation: https://cloud.google.com/dummy
-#  distribution_name: com.google.cloud:gapic-showcase
-#  library_type: OTHER
-#  GAPICs:
-#  - proto_path: schema/google/showcase/v1beta1
+- api_shortname: showcase
+  excluded_poms: gapic-showcase-bom
+  name_pretty: Showcase
+  api_description: Showcase module
+  product_documentation: https://cloud.google.com/dummy
+  distribution_name: com.google.cloud:gapic-showcase
+  library_type: OTHER
+  GAPICs:
+  - proto_path: schema/google/showcase/v1beta1
 - api_shortname: common-protos
   name_pretty: Common Protos
   product_documentation: https://github.com/googleapis/api-common-protos