Fix unclosed paren (#77)

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## Description
<!-- describe in a few words the changes -->

There was apparently uncaught syntax error that got fixed in a recent
Nushell PR

nupm/utils/misc.nu

@@ -20,7 +20,6 @@ export def check-cols [
  if not ($missing_cols | is-empty) {
  throw-error ($"Missing the following required columns in ($what):"
  + $" ($missing_cols | str join ', ')")
- )
  }
  }
 
@@ -30,7 +29,6 @@ export def check-cols [
  if not ($extra_cols | is-empty) {
  throw-error ($"Got the following extra columns in ($what):"
  + $" ($extra_cols | str join ', ')")
- )
  }
  }