test: Fix invalid fixture builder (#29783)

## **Description**

Two of the permission fixture builders were adding permissions for
accounts that do not exist. They have been updated to only grant
permissions for the selected account, which is the only account
guaranteed to exist in the default fixture.

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## **Related issues**

This was extracted from
#27847

## **Manual testing steps**

See that E2E tests still pass

## **Screenshots/Recordings**

N/A

## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
Extension Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-extension/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

test/e2e/fixture-builder.js

@@ -479,10 +479,7 @@ class FixtureBuilder {
               caveats: [
                 {
                   type: 'restrictReturnedAccounts',
-                  value: [
-                    selectedAccount.toLowerCase(),
-                    '0x09781764c08de8ca82e156bbf156a3ca217c7950',
-                  ],
+                  value: [selectedAccount.toLowerCase()],
                 },
               ],
               date: 1664388714636,
@@ -594,10 +591,7 @@ class FixtureBuilder {
               caveats: [
                 {
                   type: 'restrictReturnedAccounts',
-                  value: [
-                    '0x5cfe73b6021e818b776b421b1c4db2474086a7e1',
-                    '0x09781764c08de8ca82e156bbf156a3ca217c7950',
-                  ],
+                  value: ['0x5cfe73b6021e818b776b421b1c4db2474086a7e1'],
                 },
               ],
               date: 1664388714636,
@@ -614,10 +608,7 @@ class FixtureBuilder {
               caveats: [
                 {
                   type: 'restrictReturnedAccounts',
-                  value: [
-                    '0x5cfe73b6021e818b776b421b1c4db2474086a7e1',
-                    '0x09781764c08de8ca82e156bbf156a3ca217c7950',
-                  ],
+                  value: ['0x5cfe73b6021e818b776b421b1c4db2474086a7e1'],
                 },
               ],
               date: 1664388714636,