Profile: Add a blank line before each peer section

This is purely a cosmetic change in the generated config files.

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

app/src/main/java/com/wireguard/config/Profile.java

@@ -59,7 +59,7 @@ public class Profile {
     public String toString() {
         StringBuilder sb = new StringBuilder().append(iface.toString());
         for (Peer peer : peers)
-            sb.append(peer.toString());
+            sb.append('\n').append(peer.toString());
         return sb.toString();
     }
 }