fix: zsh import multiline issue (#2799)

Here is my case:
```sh
curl -X POST https://example.com/api \
  -H "Content-Type: application/json" \
  -d '{
    "username": "name",
    "password": "pass",
    "details": {
      "age": 30,
      "location": "Earth"
    }
  }'
```

Using current release version i got:
```sh
curl -X POST https://example.com/api \\
  -H "Content-Type: application/json" \\
  -d '{\
    "username": "name",\
    "password": "pass",\
    "details": {\
      "age": 30,\
      "location": "Earth"\
    }\
  }'
```

and i test with `echo \\`
(https://github.com/atuinsh/atuin/pull/100#issuecomment-836477081) it
also works;

there is similar PR https://github.com/atuinsh/atuin/pull/2390, it only
works on multiline with `\` suffix, in my case i got:
```sh
curl -X POST https://example.com/api \
  -H "Content-Type: application/json" \
  -d '{\
```

## Checks
- [x] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [ ] I have checked that there are no existing pull requests for the
same thing

0 files changed, 0 insertions, 0 deletions