Fix crash when using multiple clip planes in WebGPU
Fix crash when using multiple clip planes in WebGPU

sebavan/Babylon.js,RaananW/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,BabylonJS/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,sebavan/Babylon.js,sebavan/Babylon.js