Drop vanilla GetItemInfo shim for C_Item.GetItemInfo

The compat/vanilla.lua GetItemInfo override reshaped vanilla's tuple into
retail order by inserting nil at slot 4 (itemLevel), but truncated at 8
fields, dropping itemEquipLoc/itemTexture. ClassicAPI's global GetItemInfo
keeps the vanilla shape (its hook only warms the item cache), so the shim
stayed necessary but incomplete.

Remove it and point the three callers at ClassicAPI's C_Item.GetItemInfo,
which returns the full 18-field retail tuple. Positions 1-8 are identical
to the old shim output, so bags/roll are unchanged; character.lua's
itemSlot (equipLoc, field 9) was always nil under the truncating shim and
now resolves correctly for ShaguScore.

modules/bags.lua

@@ -448,7 +448,7 @@ pfUI:RegisterModule("bags", function ()
       end
     end
 
-    local _, _, q, _, _, _, itype = GetItemInfo(itemID)
+    local _, _, q, _, _, _, itype = C_Item.GetItemInfo(itemID)
 
     -- running advanced item color scan
     if C.appearance.bags.borderonlygear == "0" and texture and quality and quality < 1 then

modules/roll.lua

@@ -42,7 +42,7 @@ pfUI:RegisterModule("roll", function ()
     end
 
     local _, _, itemLink = string.find(hyperlink, "(item:%d+:%d+:%d+:%d+)")
-    local itemName = GetItemInfo(itemLink)
+    local itemName = C_Item.GetItemInfo(itemLink)
 
     -- delete obsolete tables
     if pfUI.roll.cache[itemName] and pfUI.roll.cache[itemName]["TIMESTAMP"] < GetTime() - 60 then