TunnelManager: enable Tasker support

Also fix up wording for the permission prompt that Tasker will show when
initially setting this up.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/model/TunnelManager.java

@@ -275,10 +275,7 @@ public final class TunnelManager extends BaseObservable {
                 return;
             }
 
-            /* We disable the below, for now, as the security model of allowing this
-             * might take a bit more consideration.
-             */
-            if (true)
+            if (!Application.getSharedPreferences().getBoolean("allow_remote_control_intents", false))
                 return;
 
             final State state;