Clean up imports to make Intellij code analysis happy

protocols/jc2mp.js

@@ -1,6 +1,8 @@
+const Gamespy3 = require('./gamespy3');
+
 // supposedly, gamespy3 is the "official" query protocol for jcmp,
 // but it's broken (requires useOnlySingleSplit), and doesn't include player names
-class Jc2mp extends require('./gamespy3') {
+class Jc2mp extends Gamespy3 {
     constructor() {
         super();
         this.useOnlySingleSplit = true;