Set isOpaque For BlendMode::None

Test: atest VtsHalGraphicsComposer3_TargetTest
BUG: 216205298
BUG: 219576457

Change-Id: I479d8367e5abf8893b94ac64b7149a2f0e4cf75b
diff --git a/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_ReadbackTest.cpp b/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_ReadbackTest.cpp
index c081199..72ff9ba 100644
--- a/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_ReadbackTest.cpp
+++ b/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_ReadbackTest.cpp
@@ -1132,8 +1132,8 @@
     Color mBackgroundColor;
     Color mTopLayerColor;
 };
-// TODO(b/219576457) Enable tests once we have fixed the bug on composer.
-TEST_P(GraphicsBlendModeCompositionTest, DISABLED_None) {
+
+TEST_P(GraphicsBlendModeCompositionTest, None) {
     for (ColorMode mode : mTestColorModes) {
         EXPECT_TRUE(mComposerClient
                             ->setColorMode(getPrimaryDisplayId(), mode, RenderIntent::COLORIMETRIC)