WebGPURenderer - SSRNode: Ensure boolean value for isPerspectiveCamera uniform (#32218)

* Ensure boolean value for isPerspectiveCamera uniform

* Update SSRNode.js

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Co-authored-by: Michael Herzog <michael.herzog@human-interactive.org>

examples/jsm/tsl/display/SSRNode.js

@@ -206,7 +206,7 @@ class SSRNode extends TempNode {
 		 * @private
 		 * @type {UniformNode<bool>}
 		 */
-		this._isPerspectiveCamera = uniform( camera.isPerspectiveCamera );
+		this._isPerspectiveCamera = uniform( camera.isPerspectiveCamera === true );
 
 		/**
 		 * The resolution of the pass.