test: check first element twice for sign bit being either 0 or 1

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---

Author: Planeshifter

lib/node_modules/@stdlib/number/float16/base/to-binary-string/test/test.js

@@ -95,7 +95,7 @@ tape( 'if provided `NaN`, the function returns a string where the sign bit may b
 
 	actual = toBinaryString( NaN );
 
-	t.ok( actual[0] === '0' || actual[1] === '1', 'sign bit is either 1 or 0' );
+	t.ok( actual[0] === '0' || actual[0] === '1', 'sign bit is either 1 or 0' );
 	t.strictEqual( actual.substring( 1, 6 ), exp, 'all 1s for exponent' );
 	t.notEqual( actual.substring( 6 ), frac, 'fraction does not equal all 0s' );
 	t.end();