Move ivrinput into openvr folder

Doesn't make sense for it to have it's own folder when there's an openvr
folder now.

src/openvr/openvr_init.cpp

@@ -3,7 +3,7 @@
 #include <QMessageBox>
 #include "openvr_init.h"
 #include <easylogging++.h>
-#include "../ivrinput/ivrinput_manifest.h"
+#include "../openvr/ivrinput_manifest.h"
 
 namespace openvr_init
 {

src/overlaycontroller.h

@@ -38,7 +38,7 @@
 #include "tabcontrollers/ReviveTabController.h"
 #include "tabcontrollers/UtilitiesTabController.h"
 
-#include "ivrinput/ivrinput.h"
+#include "openvr/ivrinput.h"
 
 // application namespace
 namespace advsettings