Plan heat defender is broken

**Describe the bug**
This is calling the .execute() without arguments, but it expects arguments: https://github.com/DrInfy/sharpy-sc2/blob/develop/sharpy/managers/group_combat_manager.py#L96

**To Reproduce**
Add it to bot. Should crash the bot.

**Expected behavior**
Adept should stay in places where reapers like to stay the most and kill them when seen