fmt: literal "\n" (backslash n) within html tagged template incorrectly formatted as "\\n"

Version: Deno 2.4.1

Running `deno fmt` on the following TS code:

```ts
html`\n`;
```

Gives the following result:

```ts
html`
  \\n
`;
```

Arguably short, single-line `html`-tagged template inputs shouldn't be formatted at all, but the more serious issue is that `\\n` is semantically different from `\n`.