[formatting] add newline to file(s) (#1508)

* Trail appropriate files with a new line

* For some ironic reason it ignored itself

Probably because it wasn’t tracked/commited yet.

* Rename newlines to server executable naming pattern

servers_be.json

@@ -2,4 +2,4 @@
   {
     "address": "mindustry.us.to:6568"
   }
-]
+]