Revert "Continue ignoring fingers with pressure 0 for Rambi"

This reverts commit 59d1e0494cd69983aaf3cde8a7891a117e92f276.

BUG=chrome-os-partner:39158
TEST=None

Change-Id: I6012d7c4caff6d76312185ada79febaa44352307
Reviewed-on: https://chromium-review.googlesource.com/265895
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
Commit-Queue: Andrew de los Reyes <adlr@chromium.org>
Tested-by: Andrew de los Reyes <adlr@chromium.org>
diff --git a/50-touchpad-cmt-rambi.conf b/50-touchpad-cmt-rambi.conf
index ae14158..091ea03 100644
--- a/50-touchpad-cmt-rambi.conf
+++ b/50-touchpad-cmt-rambi.conf
@@ -8,7 +8,6 @@
     Option          "Touchpad Stack Version" "2"
     Option          "Pressure Calibration Offset" "-232.615476471713"
     Option          "Pressure Calibration Slope" "4.5003322861445"
-    Option          "Filter Low Pressure" "1"
 
     # Resolution is not correctly reported by the device.
     Option          "Horizontal Resolution" "30"