fix bug with include_path -I parameter (nushell#8915)

# Description
This PR fixes a problem with the `-I` parameter. I probably broke it
when I added the `--ide-check <number>` parameter to limit the amount of
errors are shown.

# User-Facing Changes
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src/command.rs

@@ -33,11 +33,11 @@ pub(crate) fn gather_commandline_args() -> (Vec<String>, String, Vec<String>) {
 
  let flag_value = match arg.as_ref() {
  "--commands" | "-c" | "--table-mode" | "-m" | "-e" | "--execute" | "--config"
- | "--env-config" => args.next().map(|a| escape_quote_string(&a)),
+ | "--env-config" | "-I" => args.next().map(|a| escape_quote_string(&a)),
  #[cfg(feature = "plugin")]
  "--plugin-config" => args.next().map(|a| escape_quote_string(&a)),
  "--log-level" | "--log-target" | "--testbin" | "--threads" | "-t"
- | "--include-path" | "-I" | "--ide-goto-def" | "--ide-hover" | "--ide-complete"
+ | "--include-path" | "--ide-goto-def" | "--ide-hover" | "--ide-complete"
  | "--ide-check" => args.next(),
  _ => None,
  };