isolatedDeclarations doesn't preserve `const` on type parameters

Tested version: 0.16.3
```ts
> require('oxc-transform').isolatedDeclaration('hello.ts', `
    export function foo<const T>(t: T): T {
        return t;
    }
`)
{
  sourceText: 'export declare function foo<T>(t: T): T;\n',
  errors: []
}
```

Expected: `export declare function foo<const T>(t: T): T;`
Actual: `export declare function foo<T>(t: T): T;`