Initialize shadowRadius state

The uninitialized var was causing the device to incorrectly going into glcomp.

Fixes: b/144450732
Test: adb shell am instrument -w -e class android.platform.test.scenario.launcher.FlingAllAppsMicrobenchmark android.platform.test.scenario/androidx.test.runner.AndroidJUnitRunner and capture a systrace
Change-Id: Ia33a4c8908990cd12fbd5a5ce1664ed96c112832
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 00d932d..1d0ce10 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -109,6 +109,7 @@
     mCurrentState.hasColorTransform = false;
     mCurrentState.colorSpaceAgnostic = false;
     mCurrentState.metadata = args.metadata;
+    mCurrentState.shadowRadius = 0.f;
 
     // drawing state & current state are identical
     mDrawingState = mCurrentState;