WorkExecutor: drop forward declaration of WorkScheduler
WorkExecutor: drop forward declaration of WorkScheduler

Signed-off-by: Jan Viktorin <3eab6ac54c005c4408f608556a6663b7f2abede7@fit.vutbr.cz>
Reviewed-by: Jozef Halaj <d60338334aa79f5c61824693142b417ad5db682f@stud.fit.vutbr.cz>

BeeeOn/server,BeeeOn/server,BeeeOn/server,BeeeOn/server