Remove an unnecessary null pointer check

[An extra null pointer check is not needed](https://isocpp.org/wiki/faq/freestore-mgmt#delete-handles-null "Do I need to check for null before delete p?") in [the function “TriggerObject::PutTriggerInGui”](https://github.com/enginmanap/limonEngine/blob/8567ffe80456d59be227fa520da3dfe944653a2e/src/GameObjects/TriggerObject.cpp#L87 "Update candidate").