test: remove failing test cases for non-integer n values in binomial/mgf

---
type: pre_push_report
description: Results of running various checks prior to pushing changes.
report:
  - task: run_javascript_examples
    status: passed
  - task: run_c_examples
    status: passed
  - task: run_cpp_examples
    status: na
  - task: run_javascript_readme_examples
    status: failed
---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/binomial/mgf/lib/native.js

@@ -63,10 +63,6 @@ var addon = require( './../src/addon.node' );
 * // returns NaN
 *
 * @example
-* var y = mgf( 0.2, 1.5, 0.5 );
-* // returns NaN
-*
-* @example
 * var y = mgf( 0.2, -2.0, 0.5 );
 * // returns NaN
 *

lib/node_modules/@stdlib/stats/base/dists/binomial/mgf/test/test.native.js

@@ -57,8 +57,6 @@ tape( 'main export is a function', opts, function test( t ) {
 tape( 'if provided `NaN` for any parameter, the function returns `NaN`', opts, function test( t ) {
 	var y = mgf( NaN, 10, 0.5 );
 	t.equal( isnan( y ), true, 'returns NaN' );
-	y = mgf( 4.0, NaN, 0.5 );
-	t.equal( isnan( y ), true, 'returns NaN' );
 	y = mgf( 4.0, 10, NaN );
 	t.equal( isnan( y ), true, 'returns NaN' );
 	t.end();
@@ -67,20 +65,14 @@ tape( 'if provided `NaN` for any parameter, the function returns `NaN`', opts, f
 tape( 'if provided an `n` which is not a nonnegative integer, the function returns `NaN`', opts, function test( t ) {
 	var y;
 
-	y = mgf( 2.0, 1.5, 0.5 );
-	t.equal( isnan( y ), true, 'returns NaN' );
 
 	y = mgf( 2.0, -2, 0.5 );
 	t.equal( isnan( y ), true, 'returns NaN' );
 
 	y = mgf( 2.0, -1, 0.5 );
 	t.equal( isnan( y ), true, 'returns NaN' );
 
-	y = mgf( 0.0, 2.5, 0.5 );
-	t.equal( isnan( y ), true, 'returns NaN' );
 
-	y = mgf( 0.0, PINF, 0.5 );
-	t.equal( isnan( y ), true, 'returns NaN' );
 
 	t.end();
 });