Don't use -1 if provided by ProtocolDetectorService on Bungee #1064

bungee/src/main/java/us/myles/ViaVersion/bungee/service/ProtocolDetectorService.java

@@ -58,6 +58,8 @@ public class ProtocolDetectorService implements Runnable {
             @Override
             public void done(ServerPing serverPing, Throwable throwable) {
                 if (throwable == null && serverPing != null && serverPing.getVersion() != null) {
+                    // Ensure protocol is positive, some services will return -1
+                    if (serverPing.getVersion().getProtocol() > 0) {
                         detectedProtocolIds.put(key, serverPing.getVersion().getProtocol());
                         if (((BungeeConfigAPI) Via.getConfig()).isBungeePingSave()) {
                             Map<String, Integer> servers = ((BungeeConfigAPI) Via.getConfig()).getBungeeServerProtocols();
@@ -74,6 +76,7 @@ public class ProtocolDetectorService implements Runnable {
                         }
                     }
                 }
+            }
         });
     }