Fix pessimistic locking tests

Author: matthewdunbar

lib/arel/visitors/sqlserver.rb

@@ -14,7 +14,7 @@ class SQLServer < Arel::Visitors::ToSql
       # SQLServer ToSql/Visitor (Overides)
 
       def visit_Arel_Nodes_BindParam o, collector
-        collector.add_bind(o) { |i| "@#{i-1}" }
+        collector.add_bind(o.value) { |i| "@#{i-1}" }
       end
 
       def visit_Arel_Nodes_Bin o, collector