Remove unnecessary duplicate group table

stackgroup.lua

@@ -83,7 +83,6 @@ local groupEntryMetatable = {
 function stackgroup.fromChests(...)
     local chests = { ... }
     local groups = {}
-    local outGroups = {}
 
     for chestIndex,chest in ipairs(chests) do
         for slotKey,slot in pairs(chest.slots) do
@@ -111,7 +110,7 @@ function stackgroup.fromChests(...)
         end
     end
 
-    return outGroups
+    return groups
 end
 
 return stackgroup