Fixing sign type data message formatting, requiring content scroll before sign

[ryanml]

Test Plan:

1. Connect an account to https://metamask.github.io/test-dapp/
2. Initiate a Sign Typed Data V3 signature
3. Ensure the sign can be completed without issue
4. Initiate a Sign Typed Data V4 signature
5. Ensure the "Sign" button is disabled
6. Ensure that the message content area is scrollable
7. Confirm that the "Sign" button becomes enabled once the content area is scrolled through

sign-typed.mov

[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 [79623f7]

• builds: chrome, firefox, opera
• builds (beta): chrome, firefox, opera
• builds (flask): chrome, firefox, opera
• build viz: Build System
• code coverage: Report
• storybook: Storybook
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6
  • common: 0, 1, 2, 3, 4, 5, 6
  • content-script: 0
  • contentscript: contentscript
  • disable-console: disable-console
  • inpage: inpage
  • phishing-detect: phishing-detect
  • policy-load: policy-load
  • sentry-install: sentry-install
  • ui: 0, 1, 10, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1132 ± 28 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	67	1169	303	319	153
		domContentLoaded	1071	1316	1132	58	28
		load	1071	1316	1132	58	28
		domInteractive	1071	1316	1132	58	28

highlights:

storybook

• ui/components/app/signature-request/signature-request.stories.js
• ui/pages/confirm-add-suggested-token/confirm-add-suggested-token.stories.js
• ui/pages/confirm-approve/confirm-approve.stories.js
• ui/pages/confirm-deploy-contract/confirm-deploy-contract.stories.js
• ui/pages/confirm-encryption-public-key/confirm-encryption-public-key.stories.js
• ui/pages/confirm-import-token/confirm-import-token.stories.js
• ui/pages/confirm-send-ether/confirm-send-ether.stories.js
• ui/pages/confirm-token-transaction-base/confirm-token-transaction-base.stories.js