fix meta aim hands for leap subsystem

(cherry picked from commit edebf89)

Author: BryceNewell-UL

Packages/Tracking/Core/Runtime/Scripts/XRHandsSubsystem/XRHandsInputActionUpdater.cs

@@ -67,6 +67,20 @@ private static void Startup()
             currentSubsystem.updatedHands -= UpdateHands;
             currentSubsystem.updatedHands += UpdateHands;
 
+            // Create meta hands if required
+            if (ultraleapSettings.updateMetaInputSystem)
+            {
+                if (MetaAimHand.left == null)
+                {
+                    MetaAimHand.left = MetaAimHand.CreateHand(UnityEngine.XR.InputDeviceCharacteristics.Left);
+                }
+                if (MetaAimHand.right == null)
+                {
+                    MetaAimHand.right = MetaAimHand.CreateHand(UnityEngine.XR.InputDeviceCharacteristics.Right);
+                }
+            }
+
+
             SetupDefaultStateGetters();
 
             OnDeviceAdded();