Revert "Audit uses of IsRunning and GetState"

This reverts commit 72cf2bdb87.

SYSCONF settings are getting cleared when they shouldn't be. Let's
revert the change until I get proper time to figure out why it's broken.

Source/Core/DolphinQt/Settings/AudioPane.cpp

@@ -40,7 +40,8 @@ AudioPane::AudioPane()
     OnEmulationStateChanged(state != Core::State::Uninitialized);
   });
 
-  OnEmulationStateChanged(!Core::IsUninitialized(Core::System::GetInstance()));
+  OnEmulationStateChanged(Core::GetState(Core::System::GetInstance()) !=
+                          Core::State::Uninitialized);
 }
 
 void AudioPane::CreateWidgets()