sc2: Fixing typo in itemgroups.py causing spurious item groups with 2 letters chopped off (#3612)

Author: MatthewMarinets

worlds/sc2/ItemGroups.py

@@ -51,7 +51,7 @@
     item_name_groups.setdefault(data.type, []).append(item)
     # Numbered flaggroups get sorted into an unnumbered group
     # Currently supports numbers of one or two digits
-    if data.type[-2:].strip().isnumeric:
+    if data.type[-2:].strip().isnumeric():
         type_group = data.type[:-2].strip()
         item_name_groups.setdefault(type_group, []).append(item)
         # Flaggroups with numbers are unlisted