Fix incorrect default Gator Permissions SnapId (#6546)

Fixes the default configuration for snapId, by adding the missing `npm:`
prefix

## Explanation

`GatorPermissionsController` provides a default value for
`permissionsProviderSnapId`, but previously this incorrectly omitted the
`npm:` prefix.

This change adds the prefix.

Changelog: 
> Corrects the default Permissions Provider SnapId configuration value
for the `GatorPermissionsController` which was previously missing the
`npm:` prefix.

## Checklist

- [x] I've updated the test suite for new or updated code as appropriate
- N/A I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- N/A I've communicated my changes to consumers by [updating changelogs
for packages I've
changed](https://github.com/MetaMask/core/tree/main/docs/contributing.md#updating-changelogs),
highlighting breaking changes as necessary
- N/A I've prepared draft pull requests for clients and consumer
packages to resolve any breaking changes

Author: jeffsmale90

packages/gator-permissions-controller/src/GatorPermissionContoller.test.ts

@@ -121,7 +121,7 @@ describe('GatorPermissionsController', () => {
       });
 
       expect(controller.permissionsProviderSnapId).toBe(
-        '@metamask/gator-permissions-snap' as SnapId,
+        'npm:@metamask/gator-permissions-snap' as SnapId,
       );
       expect(controller.state.isGatorPermissionsEnabled).toBe(false);
       expect(controller.state.isFetchingGatorPermissions).toBe(false);
@@ -409,7 +409,7 @@ describe('GatorPermissionsController', () => {
       ).toMatchInlineSnapshot(`
         Object {
           "gatorPermissionsMapSerialized": "{\\"native-token-stream\\":{},\\"native-token-periodic\\":{},\\"erc20-token-stream\\":{},\\"erc20-token-periodic\\":{},\\"other\\":{}}",
-          "gatorPermissionsProviderSnapId": "@metamask/gator-permissions-snap",
+          "gatorPermissionsProviderSnapId": "npm:@metamask/gator-permissions-snap",
           "isFetchingGatorPermissions": false,
           "isGatorPermissionsEnabled": false,
         }

packages/gator-permissions-controller/src/GatorPermissionsController.ts

@@ -35,7 +35,7 @@ const controllerName = 'GatorPermissionsController';
 
 // Default value for the gator permissions provider snap id
 const defaultGatorPermissionsProviderSnapId =
-  '@metamask/gator-permissions-snap' as SnapId;
+  'npm:@metamask/gator-permissions-snap' as SnapId;
 
 const defaultGatorPermissionsMap: GatorPermissionsMap = {
   'native-token-stream': {},