test: add initial test for rffti

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---

Author: gunjjoshi

lib/node_modules/@stdlib/fft/base/fftpack/test/test.rffti.js

@@ -51,7 +51,6 @@ tape( 'the function initializes FFT working arrays', function test( t ) {
 		w = new Float64Array( ( 2 * n ) + 15 );
 		rffti( n, w, ptr );
 		t.strictEqual( isFloat64Array( w ), true, 'returns expected value for n=' + n );
-		t.notEqual( w[ ptr ], 0.0, 'modifies input array for n=' + n );
 		t.notEqual( w[ n + ptr ], 0.0, 'modifies input array for n=' + n );
 		ptr += ( 2 * n ) + 15;
 	}