50-touchpad-cmt-peppy.conf: reduce 2f pressure diff parameters

We've been seeing some thumbs being classified as non-thumbs on
peppy. Reducing these values encourage more (thumb) fingers to
be recognized as thumbs.

BUG=chrome-os-partner:23030
TEST=No regression on tests. Improvements:

|  peppy/move_with_thumb_3    |  success (1.0000)  |      +0.3956     |

Change-Id: I8a1ca9df08af236ceb314cb90ca0b225b5bcd156
Reviewed-on: https://chromium-review.googlesource.com/172381
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
Commit-Queue: Tai-Hsu Lin <sheckylin@chromium.org>
Tested-by: Tai-Hsu Lin <sheckylin@chromium.org>
1 file changed