Merge "Fix launch flags for channel panel" into sc-dev

        <activity android:name=".notification.app.ChannelPanelActivity"

                  android:label="@string/notification_channel_title"

                  android:theme="@style/Theme.Panel"

                  android:launchMode="singleInstance"

                  android:excludeFromRecents="true"

                  android:noHistory="true"

                  android:configChanges="orientation|keyboardHidden|screenSize"

                  android:exported="true">

            <intent-filter android:priority="1">