Paste still broken on a Timebox component after ZK-1749

Steps to Reproduce

http://zkfiddle.org/sample/2vmlqme/1-BUG-timebox-paste

• type "11:11:11" and blur
• copy the value
• paste to the second timebox

Current Result

on macOS only

• It remains empty. And you can't even simply paste text by Cmd + V.

All

• Using the context menu to paste and get the empty result.
• Copy "1:01:01 AM" and paste, the result will be "1:01:01 PM"
• Set the second timebox as "1:01:01 AM" and copy "11:11:11 AM" then paste it, the result will be "1:00:00 AM"

Expected Result

the value of the second timebox should be set correctly no matter using hotkeys or context menu

Debug Information

macOS uses Cmd key, not Ctrl key.
https://github.com/zkoss/zk/blob/v7.0.2/zul/src/archive/web/js/zul/db/Timebox.js#L393

Workaround