use ENv vars for 2FA settings

GitOrigin-RevId: b32b2d62d0f9145e5c59b8984b44940c855a1d91

services/web/config/settings.defaults.coffee

@@ -225,8 +225,8 @@ module.exports = settings =
 	httpAuthUsers: httpAuthUsers
 
 	twoFactorAuthentication:
-		enabled: false
-		requiredForStaff: false
+		enabled: process.env['TWO_FACTOR_AUTHENTICATION_ENABLED'] == 'true'
+		requiredForStaff: process.env['TWO_FACTOR_AUTHENTICATION_REQUIRED_FOR_STAFF'] == 'true'
 
 	# Default features
 	# ----------------