cp modules: function loaded() only checks current module type

Function $module->loaded() always prepends current module type to module name. As a result, checking UCP module when p_type is set to 'mcp' is not possible. This bug is caused by resolution of bug #10477.

Example where UCP modules are being checked while p_type is set to 'mcp': set of module checks in memberlist.php lines 574-578 (mode = 'viewprofile', look for $module->loaded)