fix: notification settings type

[Prithpal-Sooriya]

Description

This fixes a poor type from converting a selectors file from JS to TS.
Instead of using a custom type for the accounts type, we can just use inferred types.

Related issues

Fixes: #27645 (comment)

Manual testing steps

N/A these are only type level changes

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). 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.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[matteoscurati]

LGTM

[metamaskbot]

Builds ready [2e5c4c3]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6
  • common: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1790 ± 97 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	182	2091	1625	474	227
		domContentLoaded	1497	2265	1768	205	98
		load	1505	2277	1790	202	97
		domInteractive	16	183	44	34	17
		backgroundConnect	7	71	22	17	8
		firstReactRender	46	201	91	36	17
		getState	4	69	15	19	9
		initialActions	0	1	0	0	0
		loadScripts	1048	1666	1275	163	78
		setupStore	10	68	36	24	11
		uiStartup	1689	2523	2004	229	110

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 0 Bytes (0.00%)