leaudio/testapp: Show broadcast ID also in Hex

This is helpful mostly during Interoperability
and qualification tests.

Bug: 230340466
Tag: #feature
Sponsor: jpawlowski@
Test: atest LeAudioBroadcastServiceTest
Change-Id: I407dc7816fca30bee7b78202c6852e6ee1f1de99
Merged-In: I407dc7816fca30bee7b78202c6852e6ee1f1de99
(cherry picked from commit e3b00780)