fix syntax error

lib/acts_as_pasting/pasted.rb

@@ -16,7 +16,7 @@ module ActsAsPasting
           arel[:pasteable_type].eq(klass.constantize.base_class.name).
             and(arel[:pasteable_id].in(ids)).
             and(arel[:pasted_id].eq(source_arel[:id])).
-            and((arel[:type].eq(prefix))
+            and(arel[:type].eq(prefix))
         end.reduce(:or)
         joins(arel.join(arel).on(join_condition).join_sources).distinct
       }