perf: remove duplicate env::current_dir call in package.json search (…

…denoland#22255)

Micro-optimization.

cli/args/flags.rs

@@ -744,7 +744,7 @@ impl Flags {
  .to_owned();
  Some(p)
  } else if module_specifier.scheme() == "npm" {
- Some(std::env::current_dir().unwrap())
+ Some(current_dir.to_path_buf())
  } else {
  None
  }