fix(xfunc ARRAY filter): accept command name as predicate

Author: akinomyoga

completions/ARRAY

@@ -93,10 +93,10 @@ _comp_xfunc_ARRAY_filter()
             esac
             ;;
         *)
-            if declare -F "$2" &>/dev/null; then
+            if type -t "$2" &>/dev/null; then
                 _comp_local_predicate="$2 \"\$_comp_local_value\""
             else
-                _comp_local_predicate="local value=\$_comp_local_value; $2"
+                _comp_local_predicate="local -x value=\$_comp_local_value; $2"
             fi
             ;;
     esac