Fix creating param from variable inherits default value

Author: sunkan

src/PhpParam.php

@@ -25,6 +25,9 @@ public static function fromVariable(PhpVariable $var): self
 	{
 		$self = new self($var->getIdentifier()->getName(), $var->getType());
 		$self->variable = $var;
+		if ($var->getInitializedValue() !== PhpVariable::NO_VALUE) {
+			$self->setValue($var->getInitializedValue());
+		}
 		return $self;
 	}