Fix exception parsing with response models

Author: abnegate

templates/android/library/src/main/java/io/appwrite/exceptions/Exception.kt.twig

@@ -3,7 +3,7 @@ package {{ sdk.namespace | caseDot }}.exceptions
 import java.lang.Exception
 
 class {{spec.title | caseUcfirst}}Exception(
-    message: String? = null,
+    override val message: String? = null,
     val code: Int? = null,
     val response: String? = null
 ) : Exception(message)