Add separator to end general category in settings

                app:title="@string/settings_mms_size_title"

                tools:summary="100KB" />

            <common.widget.Separator

                android:layout_width="match_parent"

                android:layout_height="1dp"

                android:layout_marginBottom="8dp"

                android:layout_marginTop="8dp" />

            <common.widget.PreferenceView

                android:id="@+id/sync"

                android:layout_width="match_parent"