Start invocation light length from 0

Per discussion with UX

Test: verify WAI
Bug: 134590932
Change-Id: I623862ec1a24ab141584f513ddb5ab30e77f5b8f
diff --git a/packages/SystemUI/src/com/android/systemui/assist/ui/InvocationLightsView.java b/packages/SystemUI/src/com/android/systemui/assist/ui/InvocationLightsView.java
index 178f4c3..5ad6b80 100644
--- a/packages/SystemUI/src/com/android/systemui/assist/ui/InvocationLightsView.java
+++ b/packages/SystemUI/src/com/android/systemui/assist/ui/InvocationLightsView.java
@@ -130,7 +130,7 @@
             float arcLengthNormalized = cornerLengthNormalized * MINIMUM_CORNER_RATIO;
             float arcOffsetNormalized = (cornerLengthNormalized - arcLengthNormalized) / 2f;
 
-            float minLightLength = arcLengthNormalized / 2;
+            float minLightLength = 0;
             float maxLightLength = mGuide.getRegionWidth(PerimeterPathGuide.Region.BOTTOM) / 4f;
 
             float lightLength = MathUtils.lerp(minLightLength, maxLightLength, progress);