enumValues with different names in .graphql and .ts break in babel.

**Describe the bug**

Given:

```yml
schema:
- ./src/main.graphql

generates:
./src/types.ts:
plugins:
- typescript
- typescript-operations
config:
enumValues:
UserStatusNotOk: ./Enums#USER_STATUS_NOT_OK
UserStatusOk: ./Enums#UserStatusOk
```

It seems as if `enumValues` which do not have the same name in the `.ts` and `.graphql` files are now generating:

```ts
import { USER_STATUS_NOT_OK } from './Enums';
import UserStatusNotOk = USER_STATUS_NOT_OK; // <--
```

instead of the previous:
```ts
import { USER_STATUS_NOT_OK as UserStatusNotOk } from './Enums';
```

I am not sure if this is a bug, or expected behaviour, but it breaks the usage of those types with bable and `@babel/plugin-transform-typescript`.

**To Reproduce**
I have created a simple repo here:
https://github.com/philiiiiiipp/Grapqhl-Generator-Enum-Bug

**Expected behavior**

I would expect that this to still work with a project using babel and typescript.

**Additional information**

The last known working version was

```
"@graphql-codegen/cli": "^1.10.0",
"@graphql-codegen/typescript": "^1.10.0",
"@graphql-codegen/typescript-operations": "^1.10.0",
"@graphql-codegen/typescript-resolvers": "^1.10.0",
```