style: fix indentation in Rayleigh MGF C implementation

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---
type: pre_push_report
description: Results of running various checks prior to pushing changes.
report:
  - task: run_javascript_examples
    status: na
  - task: run_c_examples
    status: na
  - task: run_cpp_examples
    status: na
  - task: run_javascript_readme_examples
    status: na
  - task: run_c_benchmarks
    status: na
  - task: run_cpp_benchmarks
    status: na
  - task: run_fortran_benchmarks
    status: na
  - task: run_javascript_benchmarks
    status: passed
  - task: run_julia_benchmarks
    status: na
  - task: run_python_benchmarks
    status: na
  - task: run_r_benchmarks
    status: na
  - task: run_javascript_tests
    status: na
---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/rayleigh/mgf/benchmark/benchmark.js

@@ -35,7 +35,6 @@ bench( pkg, function benchmark( b ) {
 	var sigma;
 	var len;
 	var t;
-	var x;
 	var y;
 	var i;
 
@@ -49,7 +48,7 @@ bench( pkg, function benchmark( b ) {
 
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		y = mgf( x[ i % len ], sigma[ i % len ] );
+		y = mgf( t[ i % len ], sigma[ i % len ] );
 		if ( isnan( y ) ) {
 			b.fail( 'should not return NaN' );
 		}

lib/node_modules/@stdlib/stats/base/dists/rayleigh/mgf/src/main.c

@@ -20,9 +20,8 @@
 #include "stdlib/math/base/assert/is_nan.h"
 #include "stdlib/math/base/special/exp.h"
 #include "stdlib/math/base/special/erf.h"
-
-#define STDLIB_CONSTANT_FLOAT64_SQRT_HALF_PI 1.2533141373155002512
-#define STDLIB_CONSTANT_FLOAT64_SQRT2 1.4142135623730950488
+#include "stdlib/constants/float64/sqrt_half_pi.h"
+#include "stdlib/constants/float64/sqrt_two.h"
 
 // MAIN //
 
@@ -49,6 +48,6 @@ double stdlib_base_dists_rayleigh_mgf( const double t, const double sigma ) {
 	}
 	sigmat = t * sigma;
 	out = 1.0 + (sigmat * stdlib_base_exp( sigmat*sigmat / 2.0 ));
- 	out *= STDLIB_CONSTANT_FLOAT64_SQRT_HALF_PI * ( stdlib_base_erf( sigmat / STDLIB_CONSTANT_FLOAT64_SQRT2 ) + 1.0 );
+	out *= STDLIB_CONSTANT_FLOAT64_SQRT_HALF_PI * ( stdlib_base_erf( sigmat / STDLIB_CONSTANT_FLOAT64_SQRT2 ) + 1.0 );
 	return out;
 }