Use less steps for home gesture

Needed because when running tests in virtual devices is very slow. The previous number of steps was also greater than the default timeout for home gesture.

Fixes 215673732
Test: atest Launcher3Tests:RequestPinItemTest

Change-Id: I9b13d97deb158222ba0ebf3f6a536c5a7ae632cf
diff --git a/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java b/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
index 5511770..c22b4da 100644
--- a/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
+++ b/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
@@ -98,7 +98,7 @@
 public final class LauncherInstrumentation {
 
     private static final String TAG = "Tapl";
-    private static final int ZERO_BUTTON_STEPS_FROM_BACKGROUND_TO_HOME = 20;
+    private static final int ZERO_BUTTON_STEPS_FROM_BACKGROUND_TO_HOME = 15;
     private static final int GESTURE_STEP_MS = 16;
     private static final long FORCE_PAUSE_TIMEOUT_MS = TimeUnit.SECONDS.toMillis(2);