Added more contraints on Native Ad template to avoid unexpected button behaviors

Author: LTPhantom

packages/google_mobile_ads/android/src/main/res/layout/gnt_medium_template_view.xml

@@ -200,17 +200,19 @@
           android:id="@+id/body"
           android:maxLength="90"
           android:maxLines="2"
+          android:ellipsize="end"
           app:layout_constraintBottom_toTopOf="@+id/cta"
           app:layout_constraintEnd_toEndOf="parent"
           app:layout_constraintStart_toStartOf="parent"
           app:layout_constraintTop_toBottomOf="@id/middle"
+          app:layout_constraintHeight_max="50dp"
           android:paddingStart="@dimen/gnt_default_margin"
           android:layout_marginBottom="@dimen/gnt_small_margin"
           />
       <androidx.appcompat.widget.AppCompatButton
           android:id="@+id/cta"
           android:layout_width="match_parent"
-          android:layout_height="0dp"
+          android:layout_height="wrap_content"
           android:background="@color/gnt_blue"
           android:textColor="@color/gnt_white"
           android:layout_marginLeft="5dp"
@@ -221,6 +223,7 @@
           app:layout_constraintEnd_toEndOf="parent"
           app:layout_constraintStart_toStartOf="parent"
           app:layout_constraintTop_toBottomOf="@id/body"
+          app:layout_constraintHeight_max="50dp"
           app:layout_constraintHeight_min="35dp"
       />