bench: fix argument

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/ndarray/dnansumkbn/benchmark/benchmark.js

@@ -64,7 +64,7 @@ function createBenchmark( len ) {
 	var xbuf;
 	var x;
 
-	xbuf = filledarrayBy( len, 'float64', rand );
+	xbuf = filledarrayBy( len, options.dtype, rand );
 	x = new ndarray( options.dtype, xbuf, [ len ], [ 1 ], 0, 'row-major' );
 
 	return benchmark;