test: fix broken test

---
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---

Author: kgryte

lib/node_modules/@stdlib/blas/ext/join/test/test.assign.js

@@ -192,7 +192,7 @@ tape( 'the function throws an error if provided a separator which is not broadca
 		'dtype': 'generic'
 	};
 	x = zeros( [ 2, 2 ], opts );
-	y = empty( [ 2 ], opts );
+	y = empty( [], opts );
 
 	values = [
 		{