The 'balanced' and 'powersave' profiles used incorrect setting names in
the audio section, thus making audio codec power management not being
enabled. Make such profiles use the correct setting names.
This also fixes some warnings:
WARNING tuned.plugins.base: Unknown option 'hda_intel_powersave' for plugin 'AudioPlugin'.
WARNING tuned.plugins.base: Unknown option 'ac97_powersave' for plugin 'AudioPlugin'.