Loot table function "enchant randomly" doesn't require "treasure": true for treasure enchantments

When looting table has

"function": "enchant_randomly"

WITHOUT

"treasure": true

it can still choose treasure enchantments like mending and frost walker.

The fix for this requires changes in behaviour (adding checks for "treasure" in loot tables) and changes in loot tables of chests (adding "treasure": true).

Probably "enchant_randomly" doesn't respect "treasure": false but I haven't checked it yet.