WebGPUBackground: Fix stencilLoadValue (#22668)

examples/jsm/renderers/webgpu/WebGPUBackground.js

@@ -77,7 +77,7 @@ class WebGPUBackground {
 
 			if ( renderer.autoClearStencil === true ) {
 
-				depthStencilAttachment.stencilLoadValue = renderer._clearDepth;
+				depthStencilAttachment.stencilLoadValue = renderer._clearStencil;
 
 			} else {