device: use grey for device ID

Change-Id: Ifd88f7a123616ba180b8ad947f05a45145c138f2

ring-android/app/src/main/res/layout/item_device.xml

@@ -54,6 +54,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
         android:ellipsize="middle"
         android:singleLine="true"
         android:textAppearance="@style/TextAppearance.MaterialComponents.Caption"
+        android:textColor="?android:attr/textColorTertiary"
         tools:text="b982672502b9f1236a68353d74734cb82f9d1fab" />
 
     <TextView