Field definition for InputTypeObject does not work with callback function

[ivome]

Sometimes the fields do not get added to an InputObjectType when they are defined as a callback.

Specific example:
https://github.com/ivome/graphql-relay-php/blob/master/src/Mutation/Mutation.php#L47

If we change that to a function, the test suite fails because the fields do not get added. For the normal ObjectType this seems to work as you can see a few lines after that.

[vladar]

Should be fixed in b890ef7

[ivome]

Awesome, thanks for the quick fix! I found one more for InterfaceType, besides that, all other closure issues seem to be resolved with the latest fix. 👍