Fix bug with compression config

Author: TBlueF

BlueMapCore/src/main/java/de/bluecolored/bluemap/core/config/MainConfig.java

@@ -239,7 +239,7 @@ private MapConfig(ConfigurationNode node) throws IOException {
 
 			this.renderEdges = node.getNode("renderEdges").getBoolean(true);
 
-			this.renderEdges = node.getNode("useCompression").getBoolean(true);
+			this.useGzip = node.getNode("useCompression").getBoolean(true);
 
 			this.hiresTileSize = node.getNode("hires", "tileSize").getInt(32);
 			this.hiresViewDistance = node.getNode("hires", "viewDistance").getFloat(4.5f);