Revert "klte-common: update mixer_paths.xml"

This reverts commit 0f51d96b8c75ff77fae604f5227868843443bb8c.
klte-common: update gain for mixer patch vr-main-mic to match stock

9 recordings with the Voice Recorder app were very low, increase to
match that of stock.

Change-Id: Ia0d036e5c8bad00a8ae99e93b4ce8a60cddb34e1