BUG: fix iloc with pd.Series on pd.Categorical

Before, iloc on pd.Series returned Categorical object  for list-like  indexes input, while Series object is expected.

Fixes pandas-dev#14580

Author: nathalier

pandas/core/indexing.py

@@ -1615,6 +1615,7 @@ def _getitem_axis(self, key, axis=0):
 
                 # force an actual list
                 key = list(key)
+                return self.obj.take(key, axis=axis, convert=False)
 
             else:
                 key = self._convert_scalar_indexer(key, axis)