setOpaque to true on the surface whenever blur is not supported.

The top surface is now considered opaque and will not combine the alpha channels from the buffer for the window below.

Other changes:
 - Adds additional logs for blurRadius and isBlurOpaque

Bug: 405288154
Flag: com.android.systemui.bouncer_ui_revamp
Bug: 381263619
Test: verified manually by enabling/disabling battery saver repeatedly
Change-Id: I1a061dc111a5771c02457ea5c36f32cbe3cba699