fix(android): fix invalid encoding of scopes in query parameters

Before this, the `it.value.toString()` caused the list of scopes to be
encoded like `scopes[]=[scope1, scope2]` which is invalid.

This change fixes the encoding to `scopes[]=scope1&scopes[]=scope2` as
expected by the server.

templates/android/library/src/main/java/io/package/services/Service.kt.twig

@@ -84,7 +84,9 @@ class {{ service.name | caseUcfirst }}(client: Client) : Service(client) {
                     return@forEach
                 }
                 is List<*> -> {
-                    apiQuery.add("${it.key}[]=${it.value.toString()}")
+                    (it.value as List<*>).forEach { v ->
+                        apiQuery.add("${it.key}[]=${v.toString()}")
+                    }
                 }
                 else -> {
                    apiQuery.add("${it.key}=${it.value.toString()}")