Revert "Voice dialer priority for handling VOICE_COMMAND intents."

This reverts commit 8f4d4e3be9391201544704434e6747f6db26c0d6.

Setting the priority like this makes it effectively impossible to use
any other app for voice dialing without hacking said app.

Change-Id: I55ba3580d10516480552b9dfeb9f9d43f0340edc
JIRA:CYAN-2010