hle: kernel: thread: Replace ThreadStatus/ThreadSchedStatus with a single ThreadState.

- This is how the real kernel works, and is more accurate and simpler.

src/core/hle/kernel/kernel.cpp

@@ -602,7 +602,7 @@ void KernelCore::Suspend(bool in_suspention) {
     const bool should_suspend = exception_exited || in_suspention;
     {
         KScopedSchedulerLock lock(*this);
-        ThreadStatus status = should_suspend ? ThreadStatus::Ready : ThreadStatus::WaitSleep;
+        const auto status = should_suspend ? ThreadState::Runnable : ThreadState::Waiting;
         for (std::size_t i = 0; i < Core::Hardware::NUM_CPU_CORES; i++) {
             impl->suspend_threads[i]->SetState(status);
         }