Apply clippy fix (#7193)

# Description

rust 1.65.0 has been released for a while, this pr applies lint
suggestions from rust 1.65.0.

# User-Facing Changes

N/A

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace --features=extra -- -D warnings -D
clippy::unwrap_used -A clippy::needless_collect` to check that you're
using the standard code style
- `cargo test --workspace --features=extra` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-command/src/viewers/table.rs

@@ -973,7 +973,7 @@ fn convert_to_table2<'a>(
             data[row].push(value);
         }
 
-        let count_columns = with_index.then(|| 2).unwrap_or(1);
+        let count_columns = if with_index { 2 } else { 1 };
         let size = (data.len(), count_columns);
         let table = NuTable::new(data, size, usize::MAX, with_header, with_index);