fix(layout): AppBar use proper appearance for back button

[waterplea]

Close #8709

[lumberjack-bot]

Pull request was closed ✔️

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[github-actions]

Visit the preview URL for this PR (updated for commit 7ac2e61):

https://taiga-previews--pr9061-app-back-1npv4t9d.web.app

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[bundlemon]

BundleMon

Unchanged files (5)

Status	Path	Size	Limits
✅	demo/browser/main.(hash).js	285.74KB	+10%
✅	demo/browser/vendor.(hash).js	216.46KB	+10%
✅	demo/browser/runtime.(hash).js	42.25KB	+10%
✅	demo/browser/styles.(hash).css	13.5KB	+10%
✅	demo/browser/polyfills.(hash).js	11.2KB	+10%

Total files change -8B 0%

Groups updated (1)

Status	Path	Size	Limits
✅	demo/browser/*..js	7.01MB (+76B 0%)	-

Final result: ✅

View report in BundleMon website ➡️

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