[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

core/src/mindustry/maps/Maps.java

@@ -501,4 +501,4 @@ public class Maps{
             return provider.next(previous);
         }
     }
-}
+}

core/src/mindustry/maps/filters/TerrainFilter.java

@@ -39,4 +39,4 @@ public class TerrainFilter extends GenerateFilter{
             in.block = Blocks.air;
         }
     }
-}
+}