InputTracer: Ensure 0 coordinate values are traced

The axis bits in PointerCoords are not set when
the value is 0, since that's the default value.

Make sure the coordinate values are always traced
for pointer events.

Bug: 245989146
Change-Id: Ib9fc647f1d3166ae51b265c40e77018ad2682d23
Flag: EXEMPT tracing only
Test: Presubmit