fix: update C benchmark to use direct uniform generation

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---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/levy/pdf/benchmark/c/benchmark.c

@@ -102,9 +102,9 @@ static double benchmark( void ) {
 	int i;
 
 	for ( i = 0; i < 100; i++ ) {
-		mu[ i ] = random_uniform( 0.0, 20.0 ) - 10.0;
-		x[ i ] = random_uniform( 0.0, 40.0 ) + mu[ i ];
-		c[ i ] = random_uniform( 0.0, 5.0 ) + STDLIB_CONSTANT_FLOAT64_EPS;
+		mu[ i ] = random_uniform( -10.0, 10.0 );
+		x[ i ] = random_uniform( mu[ i ], mu[ i ] + 40.0 );
+		c[ i ] = random_uniform( STDLIB_CONSTANT_FLOAT64_EPS, 5.0 + STDLIB_CONSTANT_FLOAT64_EPS );
 	}
 
 	t = tic();