fix: UI is not displaying gas limit set by dapp

[jpuri]

Description

UI is not displaying correct gas limit set by dapp. It always displays 21000.

Related issues

Fixes: #18417

Manual testing steps

1. Submit confirmation request with gas limit not 21000
2. Check gas limit in gas editing popup

Screenshots/Recordings

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.

[metamaskbot]

Builds ready [4dcc110]

• 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, 12, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 13, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1735 ± 75 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	291	2171	1586	446	214
		domContentLoaded	1466	2112	1708	147	70
		load	1476	2154	1735	157	75
		domInteractive	23	95	42	19	9
		backgroundConnect	10	102	25	23	11
		firstReactRender	16	98	43	34	16
		getState	5	74	18	21	10
		initialActions	0	0	0	0	0
		loadScripts	1063	1694	1274	139	67
		setupStore	6	92	28	31	15
		uiStartup	1712	2725	2148	268	129

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 132 Bytes (0.00%)
• common: 0 Bytes (0.00%)