Bug 30899: [22.05.x] Follow-up for dbrev 211200041 from bug 30449

Bug 30899: [22.05.x] Follow-up for dbrev 211200041 from bug 30449

Replace DROP CONSTRAINT by DROP FOREIGN KEY in old dbrev, and
submit a new dbrev to fix cases where dbrev went wrong.

Test plan:

NOTE: When you check show create table, verify that you see an index for category_code and a foreign key called borrower_attribute_types_ibfk_1.

[1] run updatedatabase; check show create table
[2] alter table borrower_attribute_types drop foreign key borrower_attribute_types_ibfk_1; alter table borrower_attribute_types drop index category_code; RUN updatedatabase again; check show create table
[3] alter table borrower_attribute_types drop foreign key borrower_attribute_types_ibfk_1; ALTER TABLE borrower_attribute_types ADD CONSTRAINT category_code_fk FOREIGN KEY (category_code) REFERENCES categories(categorycode); RUN updatedatabase again; check show create table