Fixed connection issue

Author: YeahNotSewerSide

src/main/java/com/example/duco_miner/MainActivity.java

@@ -97,7 +97,7 @@ public void get_pool(){
         }
         try {
             ip = (String)json_response.get("ip");
-            port = Integer.parseInt((String)json_response.get("port"));
+            port = (Integer)json_response.get("port");
         }catch(Exception e){
             return;
         }