Revert "Fix double optional in init"

This reverts commit 378e607.

Author: abnegate

templates/swift/Sources/Models/Model.swift.twig

@@ -20,7 +20,7 @@ public class {{ definition | modelType(spec) | raw }} {
 
     init(
         {%~ for property in definition.properties %}
-        {{ property.name | escapeSwiftKeyword | removeDollarSign }}: {{ property | propertyType(spec) | raw  }}{% if not loop.last or (loop.last and definition.additionalProperties) %},{% endif %}
+        {{ property.name | escapeSwiftKeyword | removeDollarSign }}: {{ property | propertyType(spec) | raw  }}{% if not property.required %}?{% endif %}{% if not loop.last or (loop.last and definition.additionalProperties) %},{% endif %}
 
         {%~ endfor %}
         {%~ if definition.additionalProperties %}