fix(timeout): quote the index $i for custom IFS

Author: akinomyoga

completions/timeout

@@ -9,7 +9,7 @@ _timeout()
     for ((i = 1; i <= COMP_CWORD; i++)); do
         if [[ ${COMP_WORDS[i]} != -* && ${COMP_WORDS[i - 1]} != = ]]; then
             if "$found"; then
-                _comp_command_offset $i
+                _comp_command_offset "$i"
                 return
             fi
             found=true