[kernel] Remove process startup_bonus to timeslice

Previously we added startup_bonus to work around a segfault happening
when we preemted a newly created process instead of letting it give up
the CPU. Bug is not longer occuring, though that makes me nervous.

src/kernel/scheduler.cpp

@@ -123,7 +123,7 @@ scheduler::create_process(page_table *pml4, bool user)
 	thread *th = p->create_thread(default_priority, user);
 	auto *tcb = th->tcb();
 
-	tcb->time_left = quantum(default_priority) + startup_bonus;
+	tcb->time_left = quantum(default_priority);
 
 	log::debug(logs::task, "Creating thread %llx, priority %d, time slice %d",
 			th->koid(), tcb->priority, tcb->time_left);

src/kernel/scheduler.h

@@ -33,9 +33,6 @@ public:
 	/// How long the base timer quantum is, in us
 	static const uint64_t quantum_micros = 500;
 
-	/// How much extra time (in us) to give a process to let it load
-	static const uint64_t startup_bonus = 16000;
-
 	/// How many quanta a process gets before being rescheduled
 	static const uint16_t process_quanta = 10;