Update drop_schema.sql (#4328)

This should drop a now deprecated `admin_api_v1_0_0`, which appears to still exist in the dev environment. It is likely to also still exist in staging and prod. This update drops the table to prevent any hassles with newer table changes, migrations, etc.

backend/support/api/admin_api_v1_1_0/drop_schema.sql

@@ -1,6 +1,7 @@
 
 begin;
 
+DROP SCHEMA IF EXISTS admin_api_v1_0_0 CASCADE;
 DROP SCHEMA IF EXISTS admin_api_v1_1_0 CASCADE;
 
 commit;