Fix forgot password layout text alignment and change theme to show

correct text colour in night mode
Test: manual test
Fixes: b/206761685

Change-Id: Idccf40357a6b5f33ece89bc2772fa6ca51e4596a

res/layout/forgot_password_activity.xml

@@ -35,7 +35,6 @@
             android:id="@+id/forgot_password_text"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:gravity="center"
             android:text="@string/forgot_password_text" />
     </LinearLayout>
 </com.google.android.setupdesign.GlifLayout>