Oops, fixes PK creation logic for MySQL (had the wrong boolean)

src/Umbraco.Core/Persistence/SqlSyntax/SqlSyntaxProviderBase.cs

@@ -457,9 +457,9 @@ namespace Umbraco.Core.Persistence.SqlSyntax
             if (column.DefaultValue == null)
                 return string.Empty;
 
-            // TODO: Actually use the SystemMethods on the DTO. For now I've put a hack in to catch getdate(), not using the others at the moment
+            //hack - probably not needed with latest changes
             if (column.DefaultValue.ToString().ToLower().Equals("getdate()".ToLower()))
-                return string.Format(DefaultValueFormat, column.DefaultValue);
+                column.DefaultValue = SystemMethods.CurrentDateTime;
 
             // see if this is for a system method
             if (column.DefaultValue is SystemMethods)