fix(openssl): Use sed -E for portability

This makes this work on the BSD sed version that comes with macos.
See scop#1324

completions/openssl

@@ -46,7 +46,7 @@ _comp_cmd_openssl()
 
     if ((cword == 1)); then
         local commands
-        commands="$("$1" help 2>&1 | command sed -e '/commands\|help:/d')"
+        commands="$("$1" help 2>&1 | command sed -E '/commands|help:/d')"
         _comp_compgen -- -W "$commands"
     else
         command=${words[1]}