fix(analytics): cp-7.63.1 correct capitalization in Deep link event name (MetaMask#25592)

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## **Description**

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- fix capitalization typo in event name making it invalid agains Segment
Schema

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## **Related issues**

Fixes: https://consensyssoftware.atlassian.net/browse/MCWP-319

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk string-only change to an analytics event label plus a
matching test update; no functional logic paths are modified.
> 
> **Overview**
> Fixes the `DEEP_LINK_USED` MetaMetrics event display name
capitalization from `Deep link Used` to `Deep Link Used` to align with
expected analytics/schema naming.
> 
> Updates `DeepLinkModal` test mocks to expect the corrected event name.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
7aedbd8. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: NicolasMassart

app/components/UI/DeepLinkModal/DeepLinkModal.test.tsx

@@ -143,7 +143,7 @@ describe('DeepLinkModal', () => {
           }),
           build: jest.fn().mockImplementation(function (this: MockBuilder) {
             return {
-              name: 'Deep link Used',
+              name: 'Deep Link Used',
               properties: {
                 route: 'invalid',
                 was_app_installed: true,

app/core/Analytics/MetaMetrics.events.ts

@@ -516,7 +516,7 @@ enum EVENT_NAME {
   NetworkConnectionBannerRpcUpdated = 'Network Connection Banner RPC Updated',
 
   // Deep Link Analytics - Consolidated Event
-  DEEP_LINK_USED = 'Deep link Used',
+  DEEP_LINK_USED = 'Deep Link Used',
 
   // What's New Link Clicked
   WHATS_NEW_LINK_CLICKED = "What's New Link Clicked",