Remove @LayoutDir from tests

It's a hidden API, and thus prevents our gradle build from working.

Fixes: 163405305
Test: Manually
Change-Id: Ifdf89766d142ad78dc8584e4feb6dbb7281e37f6
diff --git a/car-ui-lib/car-ui-lib/src/androidTest/java/com/android/car/ui/TestFocusArea.java b/car-ui-lib/car-ui-lib/src/androidTest/java/com/android/car/ui/TestFocusArea.java
index a28dced..444cbc5 100644
--- a/car-ui-lib/car-ui-lib/src/androidTest/java/com/android/car/ui/TestFocusArea.java
+++ b/car-ui-lib/car-ui-lib/src/androidTest/java/com/android/car/ui/TestFocusArea.java
@@ -31,7 +31,6 @@
     /** Whether {@link #draw(Canvas)} was called. */
     private boolean mDrawCalled;
 
-    @LayoutDir
     private int mLayoutDirection = LAYOUT_DIRECTION_LTR;
 
     public TestFocusArea(Context context) {
@@ -80,7 +79,7 @@
     }
 
     @Override
-    public void setLayoutDirection(@LayoutDir int layoutDirection) {
+    public void setLayoutDirection(int layoutDirection) {
         // The real setLayoutDirection doesn't work in the test, so let's mock it.
         if (mLayoutDirection != layoutDirection) {
             mLayoutDirection = layoutDirection;