Update user consent dialog for device log access

Consent dialog string update from "Only this time" to "Allow one-time access".

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

Bug: 193708292
Test: CtsVerifier
Ignore-AOSP-First: pending fix for logcat privacy issue
Change-Id: I27c16ec89d097d52e649c961b80ffb1284680202