[DNM] disable top shadow on statusbar

* looks horrible on oled, but could not find any commit making it optional for A10 trebuchet.

src/com/android/launcher3/graphics/WorkspaceAndHotseatScrim.java

@@ -255,7 +255,7 @@ private void reapplySysUiAlpha() {
     }
 
     private void reapplySysUiAlphaNoInvalidate() {
-        float factor = mSysUiProgress * mSysUiAnimMultiplier;
+        float factor = 0.0f;
         mBottomMaskPaint.setAlpha(Math.round(MAX_HOTSEAT_SCRIM_ALPHA * factor));
         if (mTopScrim != null) {
             mTopScrim.setAlpha(Math.round(255 * factor));