can't match `export` statements

On grit 0.1.1

For some reason, I'm unable to match `export` statements.

`pattern.grit`
```grit
any {
  `import $_ from $source`,
  `export $_ from $source`
}
```

```ts
import { foo } from "./foo"
export { bar } from "./bar"
```

Run:

```sh
grit apply import-paths.grit test.ts
```

Output:

```
test.ts
     1  import { foo } from "./foo"

Processed 1 files and found 1 matches
```