Merge pull request #9038 from alivedise/bugzilla/854842_v1-train/check-ftu-running-before-changing-active-audio-channel-visibility

Bug 854842 - Check FTU running before visibility change, r=timdream, a=blocking-b2g:tef+(cherry picked from commit 48e6e68da32cb725d5182206c7bbd3490dda05a8)