Wait for map generator options longer (#3228)

2 seconds might not be enough
and 6 was enough on the old 1.5 GHz processor
running it all in a VM on HDD

src/main/java/com/faforever/client/map/generator/GeneratorOptionsTask.java

@@ -74,7 +74,7 @@ protected List<String> call() throws Exception {
         }
       });
       OsUtils.gobbleLines(process.getErrorStream(), generatorLogger::error);
-      process.waitFor(2, TimeUnit.SECONDS);
+      process.waitFor(6, TimeUnit.SECONDS);
       if (process.isAlive()) {
         process.destroyForcibly();
         log.warn("Map generator option run timed out");