Reduce "First laser crossing is not into the beam" error

There are two known reasons for this error
1. Firmware sends old events right after auto-sending is enabled
2. The finger first lands on the screen while the beam is obstructed

This change should fix both cases. But additional firmware fix would be useful
to completely avoid the first case above.

android/WALT/app/src/main/java/org/chromium/latency/walt/DragLatencyFragment.java

@@ -265,6 +265,12 @@ void reshapeAndCalculate() {
             laserEventList.remove(0);
         }
 
+        // Calculation assumes that the first event is generated by the finger obstructing the beam.
+        // Remove the first event if it was generated by finger going out of the beam (value==1).
+        while (laserEventList.size() > 0 && laserEventList.get(0).value == 1) {
+            laserEventList.remove(0);
+        }
+
         int lN = laserEventList.size();
 
         if (lN < 8) {