Loot table related recipe categories are not populated when connecting to a dedicated server

[mred231]

I was also running into a similar issue as #524.

tl;dr:
From poking around in the code, I believe it's due to LootTableFetcher not being set with a ReloadableServerRegistry here: https://github.com/way2muchnoise/JustEnoughResources/blob/master/Common/src/main/java/jeresources/util/LootTableHelper.java#L162-L179

1. Loot table based recipe categories call lootTableFetcher.getLootTable during initiation. e.g. https://github.com/way2muchnoise/JustEnoughResources/blob/master/Common/src/main/java/jeresources/compatibility/minecraft/MinecraftCompat.java#L43
2. When JER is run in the client only, the reloadable registry is unavailable and gets skipped here: https://github.com/way2muchnoise/JustEnoughResources/blob/master/Common/src/main/java/jeresources/util/LootTableHelper.java#L162-L179
3. When reloadableServerRegistries in LootTableFetcher is null, an empty loot table is returned: https://github.com/way2muchnoise/JustEnoughResources/blob/master/Common/src/main/java/jeresources/util/LootTableFetcher.java#L19-L21