Update font/color of user consent dialog for device log access

This change is to apply text font and color change for user consent
prompt when device log access is requested.

This codebase is the continuity of the implementation ag/16618162 to
obtain user consent.

Bug: 193708292
Test: CtsVerifier
Change-Id: I7f76ab9bdd76e09e98db66c60aab37e399bd637a