fix(gnokii): remove redundant LANG=C

LC_ALL=C is already specified inside _parse_help, so we do not need to
specify LANG=C at the caller side.

Author: akinomyoga

completions/gnokii

@@ -221,8 +221,7 @@ _comp_cmd_gnokii()
         esac
     fi
 
-    # safer to use LANG=C
-    local all_cmd="$(LANG=C _parse_help "$1" "--help all")"
+    local all_cmd="$(_parse_help "$1" "--help all")"
     # these 2 below are allowed in combination with others
     local main_cmd=$(command grep -v -- '--config\|--phone' <<<"$all_cmd")