Remove permission.limit (#7711)

* remove permission.limit

* set limit to amount of primaryKeys

api/src/database/migrations/20210831A-remove-limit-column.ts

@@ -0,0 +1,13 @@
+import { Knex } from 'knex';
+
+export async function up(knex: Knex): Promise<void> {
+	await knex.schema.alterTable('directus_permissions', (table) => {
+		table.dropColumn('limit');
+	});
+}
+
+export async function down(knex: Knex): Promise<void> {
+	await knex.schema.alterTable('directus_permissions', (table) => {
+		table.integer('limit').unsigned();
+	});
+}