Server compile fix.
Server compile fix.

Changed FT_CATEGORY -> FT_ROOT_INVENTORY
Removed AT_ROOT_CATEGORY

This parallels llasset cleanup work done on viewer-side for removing the unused AT_ROOT_CATEGORY type, and for making it more clear that a folder of type FT_CATEGORY (now FT_ROOT_INVENTORY) is your "My Inventory" folder.

gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm