QueryBuilder: fix USER_DEFINED type

Author: codemasher

src/Query/QueryBuilder.php

@@ -157,6 +157,11 @@ public function primaryKey(string $field, string $dir = null):CreateTable{
 
 					/** @inheritdoc */
 					public function field(string $name, string $type, $length = null, string $attribute = null, string $collation = null, bool $isNull = null, string $defaultType = null, $defaultValue = null, string $extra = null):CreateTable{
+
+						if(is_scalar($defaultValue) && $defaultType !== null){
+							$defaultType = 'USER_DEFINED';
+						}
+
 						$this->cols[$name] = $this->dialect->fieldspec($name, $type, $length, $attribute, $collation, $isNull, $defaultType, $defaultValue, $extra);
 
 						return $this;