Fix recognizing Oculus devices in UnityXRModule

Author: lawwong

Assets/HTC.UnityPlugin/VRModule/Modules/UnityXRModuleBase.cs

@@ -82,6 +82,7 @@ private struct XRInputSubsystemProfile
         private uint uxrLeftIndex = INVALID_DEVICE_INDEX;
         private uint moduleRightIndex = INVALID_DEVICE_INDEX;
         private uint moduleLeftIndex = INVALID_DEVICE_INDEX;
+        private string hmdDeviceName = string.Empty;
         private VRModule.SubmoduleBase.Collection submodules = new VRModule.SubmoduleBase.Collection(
             new ViveHandTrackingSubmodule(),
             new WaveHandTrackingSubmodule(),
@@ -149,7 +150,6 @@ public sealed override void BeforeRenderUpdate()
 
             InputDevices.GetDevices(connectedDevices);
 
-            var hmdModelNum = string.Empty;
             foreach (var device in connectedDevices)
             {
                 if (!indexMap.TryGetIndex(device, out deviceIndex))
@@ -161,14 +161,14 @@ public sealed override void BeforeRenderUpdate()
                         deviceIndex = VRModule.HMD_DEVICE_INDEX;
                         EnsureValidDeviceState(deviceIndex, out prevState, out currState);
                         deviceName = device.name;
-                        hmdModelNum = deviceName + " - ";
+                        hmdDeviceName = deviceName + " - ";
                     }
                     else
                     {
                         // this function will skip VRModule.HMD_DEVICE_INDEX (preserved index for HMD)
                         deviceIndex = FindAndEnsureUnusedNotHMDDeviceState(out prevState, out currState);
                         indexMap.MapNonHMD(device, deviceIndex);
-                        deviceName = hmdModelNum + device.name;
+                        deviceName = hmdDeviceName + device.name;
                     }
 
                     currState.deviceClass = GetDeviceClass(device.name, device.characteristics);