Fix WebGPU voxel vertex shader syntax (#17346)

Just a quick fix for the voxel shader in WebGPU.

Author: MiiBond

packages/dev/core/src/ShadersWGSL/iblVoxelGrid.vertex.fx

@@ -67,7 +67,7 @@ fn main(input : VertexInputs) -> FragmentInputs {
 
 #include <morphTargetsVertexGlobal>
 let inputPosition: vec3f = positionUpdated;
-#include <morphTargetsVertex>("vertexInputs.position\\),inputPosition\\)")[0..maxSimultaneousMorphTargets]
+#include <morphTargetsVertex>(vertexInputs.position\\),inputPosition))[0..maxSimultaneousMorphTargets]
 
 #include <instancesVertex>