Removed another duplicate test method

tests/unit/Config/MergeCest.php

@@ -419,75 +419,6 @@ private function getMergedByArray(): Config
         return $config;
     }
 
-    /**
-     * Tests issue 13351
-     *
-     * @link   https://github.com/phalcon/cphalcon/issues/13351
-     * @author Zamrony P. Juhara <zamronypj@yahoo.com>
-     * @since  2018-04-27
-     */
-    public function testIssue13351MergeNonZeroBasedNumericKey(UnitTester $I)
-    {
-        $config  = new Config([1 => 'Apple']);
-        $config2 = new Config([2 => 'Banana']);
-        $config->merge($config2);
-
-        $expected = [
-            1 => 'Apple',
-            2 => 'Banana',
-        ];
-        $actual   = $config->toArray();
-        $I->assertEquals($expected, $actual);
-
-
-        $config  = new Config([0 => 'Apple']);
-        $config2 = new Config([1 => 'Banana']);
-        $config->merge($config2);
-
-        $expected = [
-            0 => 'Apple',
-            1 => 'Banana',
-        ];
-        $actual   = $config->toArray();
-        $I->assertEquals($expected, $actual);
-
-        $config  = new Config([1 => 'Apple', 'p' => 'Pineapple']);
-        $config2 = new Config([2 => 'Banana']);
-        $config->merge($config2);
-
-        $expected = [
-            1   => 'Apple',
-            'p' => 'Pineapple',
-            2   => 'Banana',
-        ];
-        $actual   = $config->toArray();
-        $I->assertEquals($expected, $actual);
-
-        $config  = new Config([
-            'One' => [1 => 'Apple', 'p' => 'Pineapple'],
-            'Two' => [1 => 'Apple'],
-        ]);
-        $config2 = new Config([
-            'One' => [2 => 'Banana'],
-            'Two' => [2 => 'Banana'],
-        ]);
-        $config->merge($config2);
-
-        $expected = [
-            'One' => [
-                1   => 'Apple',
-                'p' => 'Pineapple',
-                2   => 'Banana',
-            ],
-            'Two' => [
-                1 => 'Apple',
-                2 => 'Banana',
-            ],
-        ];
-        $actual = $config->toArray();
-        $I->assertEquals($expected, $actual);
-    }
-
     /**
      * Tests Phalcon\Config :: merge()
      *