`gw-product-quantity-conditional.php`: Added snippet to use quantity value of Product Field as a conditional logic field.

[saifsultanc]

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Context

⛑️ Ticket(s): https://secure.helpscout.net/conversation/2951687684/84205

Summary

Targeting Single Product field's quantity input to be applicable in Gravity Forms' regular conditional logic.

Snippet Demo: https://www.loom.com/share/38547a28853f4706b10cfdb42eaa45ca