refs #16421 [fid_bbi] fixes API config

* adjust default api base url
* drop custom alpha fid configuration

fid_bbi/alpha/config/vufind/fid.ini

-[Parent_Config]
-relative_path=../../../config/vufind/fid.ini
-
-[Client]
-baseUrl = https://bbi-admin.finc.info/bbi-alpha.3

fid_bbi/config/vufind/fid.ini

@@ -2,4 +2,4 @@
 relative_path = ../../../fid/config/vufind/fid.ini
 
 [Client]
-baseUrl = https://bbi-admin.finc.info/bbi-staging
+baseUrl = https://bbi-admin.finc.info/staging/bbi