Add transition name to transition test layout

Bug: 254584750
Test: atest
CtsTransitionTestCases: ActivityTransitionTest#testTwiceForwardTwiceBack
Change-Id: Id2cf4a6275ebe78d43048f19ab6e2a3b993676c1
diff --git a/tests/tests/transition/res/layout/transition_main.xml b/tests/tests/transition/res/layout/transition_main.xml
index 64de7dd..b336320 100644
--- a/tests/tests/transition/res/layout/transition_main.xml
+++ b/tests/tests/transition/res/layout/transition_main.xml
@@ -17,4 +17,5 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
-             android:id="@+id/container"/>
+             android:id="@+id/container"
+             android:transitionName="transition_main"/>