Fix GL error originating from createDepthStencil texture on WebGL1.
Fix GL error originating from createDepthStencil texture on WebGL1.

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