tiny indentation fix

Author: sampsyo

beets/ui/commands.py

@@ -721,7 +721,7 @@ def resolve_duplicate(self, task):
         that's already in the library.
         """
         log.warn("This %s is already in the library!" %
-                ("album" if task.is_album else "item"))
+                 ("album" if task.is_album else "item"))
 
         if config['import']['quiet']:
             # In quiet mode, don't prompt -- just skip.