InputCommon: Use nested namespace specifiers where applicable

Source/Core/InputCommon/ControllerInterface/ForceFeedback/ForceFeedbackDevice.cpp

@@ -9,9 +9,7 @@
 
 #include "Common/Thread.h"
 
-namespace ciface
-{
-namespace ForceFeedback
+namespace ciface::ForceFeedback
 {
 // Template instantiation:
 template class ForceFeedbackDevice::TypedForce<DICONSTANTFORCE>;
@@ -257,6 +255,4 @@ void ForceFeedbackDevice::Force::Release()
   m_effect->Unload();
   m_effect->Release();
 }
-
-}  // namespace ForceFeedback
-}  // namespace ciface
+}  // namespace ciface::ForceFeedback

Source/Core/InputCommon/ControllerInterface/ForceFeedback/ForceFeedbackDevice.h

@@ -19,9 +19,7 @@
 #include "InputCommon/ControllerInterface/ForceFeedback/OSX/DirectInputAdapter.h"
 #endif
 
-namespace ciface
-{
-namespace ForceFeedback
+namespace ciface::ForceFeedback
 {
 class ForceFeedbackDevice : public Core::Device
 {
@@ -83,6 +81,4 @@ private:
   Common::Event m_update_event;
   Common::Flag m_run_thread;
 };
-
-}  // namespace ForceFeedback
-}  // namespace ciface
+}  // namespace ciface::ForceFeedback

Source/Core/InputCommon/ControllerInterface/ForceFeedback/OSX/DirectInputAdapter.h

@@ -20,9 +20,7 @@ typedef LONG* LPLONG;  // Missing type for ForceFeedback.h
 #include "Common/CommonTypes.h"    // for LONG
 #include "DirectInputConstants.h"  // Not stricty necessary
 
-namespace ciface
-{
-namespace ForceFeedback
+namespace ciface::ForceFeedback
 {
 // Prototypes
 class IUnknownImpl;
@@ -196,5 +194,4 @@ public:
     return FFDeviceSetForceFeedbackProperty(m_device, property, &value);
   }
 };
-}  // namespace ForceFeedback
-}  // namespace ciface
+}  // namespace ciface::ForceFeedback