Update mirror layer tests to support detach mirror flag

We changed mirroring behavior to ignore the local transforms
to support cases like mirroring a freeform window.
This cl fixes the tests to update the position of the mirrored
layer if the flag is set.

Bug: 337845753
Test: presubmit

Change-Id: I28294c36afb4d9f0de2e6c6017332617315f0c4d
diff --git a/services/surfaceflinger/FrontEnd/LayerSnapshotBuilder.cpp b/services/surfaceflinger/FrontEnd/LayerSnapshotBuilder.cpp
index e40c79c..f2497d4 100644
--- a/services/surfaceflinger/FrontEnd/LayerSnapshotBuilder.cpp
+++ b/services/surfaceflinger/FrontEnd/LayerSnapshotBuilder.cpp
@@ -362,6 +362,7 @@
     snapshot.gameMode = gui::GameMode::Unsupported;
     snapshot.frameRate = {};
     snapshot.fixedTransformHint = ui::Transform::ROT_INVALID;
+    snapshot.ignoreLocalTransform = false;
     return snapshot;
 }