`gw-limit-multiselect.js`: Fixed an issue with limit multi-select not working with GP Advanced Select.

[saifsultanc]

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Context

⛑️ Ticket(s): https://secure.helpscout.net/conversation/2301130622/52247/

Summary

Add support for Tom Select (GP Advanced Select) to work with the Limit Multi-Select snippet.

After the update, standard behaviour (without GPAS) still works fine: https://www.loom.com/share/a8bbd3644f074653a756523d99541c5a

After the update, the behaviour with GPAS is fixed: https://www.loom.com/share/8d6463d62cfe47d8884783e1471d3a77