Use switch instead of checkbox for emoji setting.

Closes #5167
Fixes #5073
// FREEBIE.

res/xml/preferences_advanced.xml

@@ -13,7 +13,8 @@
                         android:summary="@string/preferences__pressing_the_enter_key_will_send_text_messages"
                         android:title="@string/preferences__pref_enter_sends_title"/>
 
-    <CheckBoxPreference android:defaultValue="false"
+    <org.thoughtcrime.securesms.components.SwitchPreferenceCompat
+                        android:defaultValue="false"
                         android:key="pref_system_emoji"
                         android:title="@string/preferences_advanced__use_system_emoji"
                         android:summary="@string/preferences_advanced__disable_signal_built_in_emoji_support" />