Add missing actuatorgroupdisable default to mjcPhysics schema.

PiperOrigin-RevId: 781487140
Change-Id: I7b0ff3a015e0c6b229e5409455a648f6d2399617

Author: havess

include/mujoco/experimental/usd/mjcPhysics/sceneAPI.h

@@ -773,7 +773,7 @@ class MjcPhysicsSceneAPI : public UsdAPISchemaBase {
   ///
   /// | ||
   /// | -- | -- |
-  /// | Declaration | `uniform int[] mjc:option:actuatorgroupdisable` |
+  /// | Declaration | `uniform int[] mjc:option:actuatorgroupdisable = []` |
   /// | C++ Type | VtArray<int> |
   /// | \ref Usd_Datatypes "Usd Type" | SdfValueTypeNames->IntArray |
   /// | \ref SdfVariability "Variability" | SdfVariabilityUniform |

src/experimental/usd/mjcPhysics/generatedSchema.usda

@@ -99,7 +99,7 @@ class "MjcSceneAPI" (
         displayName = "Solver Warm-Starting Toggle"
         doc = "Enables warm-starting of the constraint solver, using the solution from the previous time step to initialize the iterative optimization."
     )
-    uniform int[] mjc:option:actuatorgroupdisable (
+    uniform int[] mjc:option:actuatorgroupdisable = [] (
         displayName = "Actuator Group Disable"
         doc = "List of actuator groups to disable."
     )

src/experimental/usd/mjcPhysics/schema.usda

@@ -318,7 +318,7 @@ class "MjcSceneAPI"
         Distance Field collisions."""
     )
 
-    uniform int[] mjc:option:actuatorgroupdisable (
+    uniform int[] mjc:option:actuatorgroupdisable  = [] (
         customData = {
             string apiName = "ActuatorGroupDisable"
         }