Standing sign special model renderer uses misspelled JSON field "attachement" instead of "attachment"

The StandingSignSpecialRenderer codec uses the misspelled field name "attachement" (extra 'e') instead of "attachment" for the optional attachment type field in item model definitions.

In StandingSignSpecialRenderer.java:

PlainSignBlock.Attachment.CODEC
    .optionalFieldOf("attachement", PlainSignBlock.Attachment.GROUND)

Should be:

PlainSignBlock.Attachment.CODEC
    .optionalFieldOf("attachment", PlainSignBlock.Attachment.GROUND)

The HangingSignSpecialRenderer correctly uses "attachment".

This is the same typo that previously existed in jigsaw block data as "attachement_type", which was fixed via JigsawPropertiesFix.

No vanilla item definitions use the minecraft:standing_sign special model type, so this has gone unnoticed. It would affect any resource pack attempting to use this special type with a non-default attachment.