fix: ensure correct seed validation

The previous implementation used a direct property check (`config.seed`),
which could inadvertently treat falsy values, such as `0`, as missing, leading
to incorrect seed validation.

PR-URL: #3007
Closes: #2952
Reviewed-by: Athan Reines <kgryte@gmail.com>

lib/node_modules/@stdlib/random/shuffle/lib/factory.js

@@ -28,6 +28,7 @@ var deepCopy = require( '@stdlib/utils/copy' );
 var floor = require( '@stdlib/math/base/special/floor' );
 var randu = require( '@stdlib/random/base/mt19937' ).factory;
 var format = require( '@stdlib/string/format' );
+var hasOwnProp = require( '@stdlib/assert/has-own-property' );
 var defaults = require( './defaults.json' );
 var validate = require( './validate.js' );
 
@@ -63,7 +64,7 @@ function factory( config ) {
 			throw err;
 		}
 	}
-	if ( config && config.seed ) {
+	if ( config && hasOwnProp( config, 'seed' ) ) {
 		rand = randu({
 			'seed': config.seed
 		});