fix ot_websites.subdomain db field size

ot_core/ext_tables.sql

@@ -17,7 +17,7 @@ CREATE TABLE ot_websites
     uid INT UNSIGNED NOT NULL AUTO_INCREMENT,
     organization_id INT NOT NULL,
     organization_name VARCHAR(255) NOT NULL,
-    subdomain VARCHAR(45) NOT NULL,
+    subdomain VARCHAR(255) NOT NULL,
     custom_domain VARCHAR(255),
     locale VARCHAR(10) DEFAULT 'fr-FR',
     config_identifier VARCHAR(45),