src/db/tables/featureFlags.ts uses `modified_at` whereas other tables use `updated_at`

[pdehaan]

Pretty tiny nit, but… was randomly trying to grep for knex+.update() statements without an updated_at column, but came across something possibly odd.

git grep -P -A6 "\.update\(" | grep -Eo "\s[a-z_]+_at: knex.fn.now\(\)" | sort | uniq -c
   1  deleted_at: knex.fn.now()
   6  modified_at: knex.fn.now()
  18  updated_at: knex.fn.now()

Looks like the majority of .update() queries are using an updated_at column, it looks like featureFlags.ts might be an outlier w/ modified_at:

git grep -P -A6 "\.update\(" | grep -E "\s[a-z_]+_at: knex.fn.now\(\)" | sort | uniq -c
   1 src/db/tables/emailAddresses.js-            updated_at: knex.fn.now()
   2 src/db/tables/emailAddresses.js-      updated_at: knex.fn.now()
   1 src/db/tables/emailAddresses.js-      updated_at: knex.fn.now(),
   1 src/db/tables/featureFlags.ts-      deleted_at: knex.fn.now(),
   6 src/db/tables/featureFlags.ts-      modified_at: knex.fn.now(),
   1 src/db/tables/onerep_scans.ts-      updated_at: knex.fn.now(),
   2 src/db/tables/onerep_scans.ts-    updated_at: knex.fn.now(),
   2 src/db/tables/subscribers.js-        updated_at: knex.fn.now(),
   9 src/db/tables/subscribers.js-      updated_at: knex.fn.now(),

---

Conversely, we can grep by knex.fn.now():

git grep -Po "\b[a-z_]+: knex.fn.now\(\)" src/db/tables | grep -v "ts-ignore" | sort | uniq -c
   4 src/db/tables/emailAddresses.js:updated_at: knex.fn.now()
   1 src/db/tables/featureFlags.ts:deleted_at: knex.fn.now()
   6 src/db/tables/featureFlags.ts:modified_at: knex.fn.now()
   1 src/db/tables/onerep_profiles.ts:created_at: knex.fn.now()
   2 src/db/tables/onerep_scans.ts:created_at: knex.fn.now()
   3 src/db/tables/onerep_scans.ts:updated_at: knex.fn.now()
  12 src/db/tables/subscribers.js:updated_at: knex.fn.now()

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