SurfaceFlinger: remove rounded corner from Refresh Rate Overlay

Rounded corner requires client composition and may change the timing
of frames.

Bug: 131887402
Test: adb shell service call SurfaceFlinger 1034 i32 1
Change-Id: I336823376e982de85f328af96fa5198a90fe6564
diff --git a/services/surfaceflinger/RefreshRateOverlay.cpp b/services/surfaceflinger/RefreshRateOverlay.cpp
index d3fe7b6..1e5c25f 100644
--- a/services/surfaceflinger/RefreshRateOverlay.cpp
+++ b/services/surfaceflinger/RefreshRateOverlay.cpp
@@ -39,7 +39,6 @@
 
     mLayer = mClient->getLayerUser(mIBinder);
     mLayer->setCrop_legacy(Rect(50, 70, 200, 100), true);
-    mLayer->setCornerRadius(15.0f);
     mLayer->setLayer(INT32_MAX - 2);
 
     return true;