Removing TSPropertySignature node adds commas to the type declaration

I originally opened this issue on the jscodeshift project (facebook/jscodeshift#464), but I'm pretty sure it is originating on this library.
Basically when you try to remove a type property of a type definition you get unneeded commas like it was an object.
This only happens for typescript, if you use flow you have to use ObjectTypeProperty that works correctly.

Input:

```ts
type Props = {
__: translator;
form: Form;
isOpen: boolean;
closeModal: () => void;
};
```

Execute:

```ts
j(file.source).find(j.TSPropertySignature, { key: { name: "__" } }).remove();
```

Output:

```
type Props = {
form: Form;,
isOpen: boolean;,
closeModal: () => void;
};
```

Reproduce the issue with the provided TypeScript type definition and jscodeshift query that removes TSPropertySignature. Trace the removal and printing path for TypeScript properties, comparing it with the Flow ObjectTypeProperty behavior. Done means the remaining properties print with semicolons and no extra commas.

Written by the indexing model from the issue text.