CiviGrant - Remove non-functional setting for grants tab in `contact_view_options`

Fixes #3159

The status of the tab can be controlled at a coarse level by disabling/enabling the CiviGrant extension,
and at a finer level with the Contact Layout Editor extension, making this option unnecessary.
Since it's broken, it seemed best to remove it.

ext/civigrant/managed/OptionGroup_contact_view_options_OptionValue_CiviGrant.mgd.php

-<?php
-return [
-  [
-    'name' => 'OptionGroup_contact_view_options_OptionValue_CiviGrant',
-    'entity' => 'OptionValue',
-    'cleanup' => 'unused',
-    'update' => 'unmodified',
-    'params' => [
-      'version' => 4,
-      'values' => [
-        'option_group_id.name' => 'contact_view_options',
-        'label' => 'Grants',
-        'value' => '11',
-        'name' => 'CiviGrant',
-        'grouping' => NULL,
-        'filter' => 0,
-        'is_default' => FALSE,
-        'weight' => 11,
-        'description' => NULL,
-        'is_optgroup' => FALSE,
-        'is_reserved' => FALSE,
-        'is_active' => TRUE,
-        'icon' => NULL,
-        'color' => NULL,
-        'component_id' => NULL,
-        'domain_id' => NULL,
-        'visibility_id' => NULL,
-      ],
-    ],
-  ],
-];

settings/Core.setting.php

@@ -28,7 +28,7 @@ return [
     'pseudoconstant' => [
       'optionGroupName' => 'contact_view_options',
     ],
-    'default' => '
1
2
3
4
5
6
7
8
9
10
11
13
',
+    'default' => '
1
2
3
4
5
6
7
8
9
10
13
',
     'add' => '4.1',
     'title' => ts('Viewing Contacts'),
     'is_domain' => '1',