Sync delete icon/color isn't from Nala

[MadhaviSeelam]

Description

After deleting Sync account, the warning message that was shown has an icon/color that is not from Nala

Steps to reproduce

1. Install 1.71.110
2. Launch Brave
3. Visit wikipedia.org
4. Enable Sync on Profile 1
5. Join sync on Profile 2
6. Click Delete Sync account on Profile 2
7. Return to Profile 1
8. Stay on the page for few seconds to trigger This Brave Sync account was deleted.... message

Actual result

Sync delete icon/color is not from Nala

example	example	example

Another instance:

Expected result

Nala color and icon should show in the Sync warning message

Reproduces how often

Easily reproduced

Brave version (brave://version info)

Brave	1.71.110 Chromium: 129.0.6668.100 (Official Build) beta (64-bit)
Revision	46cd0b1af7127687895fcaceff93dd80e29e6f2b
OS	Windows 11 Version 23H2 (Build 22631.4317)

Channel information

• [x] release (stable)
• [x] beta
• [ ] nightly

Reproducibility

• [ ] with Brave Shields disabled
• [ ] with Brave Rewards disabled
• [ ] in the latest version of Chrome

Miscellaneous information

@rebron @aguscruiz cc: @brave/qa-team

[aguscruiz]

We should use our warning-circle-outline in semantic/icon/default color

Quick mock here