Removes obsolete alpha modifications

This is no longer needed and runs the risk of conflicting with alpha
modifications performed in the new Assistant visualizations.

Test: Tested locally
BUG:133327495
Change-Id: I7b353520351513251db9792b7ab2f5c2690efead

packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java

@@ -1440,10 +1440,8 @@ public class NotificationPanelView extends PanelView implements
         } else if (statusBarState == StatusBarState.KEYGUARD
                 || statusBarState == StatusBarState.SHADE_LOCKED) {
             mKeyguardBottomArea.setVisibility(View.VISIBLE);
-            mKeyguardBottomArea.setAlpha(1f);
         } else {
             mKeyguardBottomArea.setVisibility(View.GONE);
-            mKeyguardBottomArea.setAlpha(1f);
         }
     }