Re-add Android Auto manifest entry

Voice reply is now verified to work,
so it should be safe to re-add the
Android Auto manifest entry.

Closes #6180
//FREEBIE

AndroidManifest.xml

@@ -108,8 +108,8 @@
     <meta-data android:name="org.thoughtcrime.securesms.mms.TextSecureGlideModule"
                android:value="GlideModule" />
 
-    <!--<meta-data android:name="com.google.android.gms.car.application"-->
-               <!--android:resource="@xml/automotive_app_desc" />-->
+    <meta-data android:name="com.google.android.gms.car.application"
+               android:resource="@xml/automotive_app_desc" />
 
     <activity android:name="org.thoughtcrime.redphone.RedPhone"
               android:excludeFromRecents="true"