fix: corrige la migration des substances fiscales (#640)

.env-example

dev/database/substances-fiscales.ts

knex/migrations/20180521000004_substances.js

knex/migrations/20181106000001_metas_activites.js

src/api/graphql/resolvers/_titre-activite.ts

src/api/graphql/resolvers/titres-activites.ts

src/types.ts