Remove odd ivar from ActiveRecord::LogSubscriber

This was used to switch the output colour between log lines, but now the
output colour is based on the type of statement being logged instead.

activerecord/lib/active_record/log_subscriber.rb

@@ -15,11 +15,6 @@ def self.reset_runtime
       rt
     end
 
-    def initialize
-      super
-      @odd = false
-    end
-
     def render_bind(attr, type_casted_value)
       value = if attr.type.binary? && attr.value
         "<#{attr.value_for_database.to_s.bytesize} bytes of binary data>"