Use map-id instead of map-name for render-task name

Author: TBlueF

BlueMapCLI/src/main/java/de/bluecolored/bluemap/cli/BlueMapCLI.java

@@ -196,7 +196,7 @@ public void renderMaps() throws IOException {
 					continue;
 				}
 
-				RenderTask task = new RenderTask(map.getName(), map);
+				RenderTask task = new RenderTask(map.getId(), map);
 				task.addTiles(tiles);
 				task.optimizeQueue();