Single line for output switcher panel title

Bug: 155956511
Test: manual
Change-Id: I2c33783d55c0ab5358b7fd1f4a0f405b3e25ff2b

res/layout/panel_layout.xml

@@ -51,6 +51,7 @@
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginStart="16dp"
+                android:layout_marginEnd="16dp"
                 android:gravity="center_vertical"
                 android:orientation="vertical"
                 android:paddingBottom="9dp"
@@ -59,6 +60,8 @@
                     android:id="@+id/header_title"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
+                    android:ellipsize="end"
+                    android:maxLines="1"
                     android:textColor="?android:attr/textColorPrimary"
                     android:textSize="20sp"/>