LineageParts: Fix KeyHandler for opening messaging app

This fixes touchscreen gesture assigned to messaging app. Before this fix
it would open random app - System Tracer for me, Google Photos for someone
else.

Change-Id: I5675382c5bdeaaca304ca5bbec4c123fd0327674
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>