Increase click offset

It turns out that 3mm extra doesn't seem to be enough to produce
physical clicks.  This increases the offset to 5mm so that calibrated
values can be used for phsyical clicking tests.

BUG=chromium:229600
TEST=manual

Change-Id: I1c30441068b9f55fc64f41a3f75c7a2d8fa7543b
Signed-off-by: Charlie Mooney <charliemooney@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/48171
Reviewed-by: Joseph Shyh-In Hwang <josephsih@chromium.org>
diff --git a/roibot/__init__.py b/roibot/__init__.py
index 97f8daf..f59f14c 100644
--- a/roibot/__init__.py
+++ b/roibot/__init__.py
@@ -33,7 +33,7 @@
 
     # The offsets from the calibrated z value and the tap and click z's
     TAP_Z_OFFSET = 0
-    CLICK_Z_OFFSET = 3
+    CLICK_Z_OFFSET = 5
 
     def __init__(self, device):
         exec 'from devices.%s import bounds' % device