Fix ExpressionMapper error for sub property expression conversion

Fix Issues with Expression Mappings #648 when use properties which types have their own mappings that need to be converted over.

Multiple scenarios have been solved for now including the original problem.
Issue still lies with multiple level same type one to many relationships. (One to many relationships of different types work fine)
Ex: ```Tools.Any(t => t.SubTools.Any(t => t.ID == id))``` will fail to convert over cause Any function will still be assuming ToolDTO instead of Tool as generic parameter type.
Don't need the variable at all actually