Centered fingerprint icon

Test: Verified icon was centered in the fingerprint enrollment finish
page.
Fixes: 258604191

Change-Id: I33f19731921ef39829a6bbbaa1d1b097b95d64d4
diff --git a/res/layout/sfps_enroll_finish_base.xml b/res/layout/sfps_enroll_finish_base.xml
index 1773337..f58b86c 100644
--- a/res/layout/sfps_enroll_finish_base.xml
+++ b/res/layout/sfps_enroll_finish_base.xml
@@ -45,7 +45,7 @@
                 android:layout_marginTop="24dp"
                 android:paddingTop="0dp"
                 android:paddingBottom="0dp"
-                android:gravity="center">
+                android:layout_gravity="center">
 
                 <ImageView
                     android:id="@+id/fingerprint_in_app_indicator"