DSPManager: grammar correction

https://jira.cyanogenmod.org/browse/CYAN-1873

Change-Id: Icf06220def1b04b2ab077c103d5ad3e7db2f5d1b
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_packages_apps_DSPManager into cm-10.1