Change config path for LE Audio Capabilities file
Since there is no different setting for sub project under same prohject,
we will change the setting file from `bluetooth/project/` to
`bluetooth/` to simplify the file structure.
Bug: 238983662
Test: make sure file added in config folder can be copied into devices
Change-Id: Icf39d92526713df717c73acffbaee541058a3fd2