refactor: use a function wrapper for native binding

PR-URL: #13002
Reviewed-by: Athan Reines <kgryte@gmail.com>

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/bradford/median/lib/native.js

@@ -56,7 +56,9 @@ var addon = require( './../src/addon.node' );
 * var v = median( NaN );
 * // returns NaN
 */
-var median = addon;
+function median( c ) {
+	return addon( c );
+}
 
 
 // EXPORTS //