fix false config input

Author: suerion

core/src/main/java/pl/skidam/automodpack_core/config/Jsons.java

@@ -109,6 +109,7 @@ public static class ModpackContentFields {
         public String loader = "";
         public String loaderVersion = "";
         public String mcVersion = "";
+        public boolean enableFullServerPack = false;
         public Set<ModpackContentItem> list;
 
         public ModpackContentFields(Set<ModpackContentItem> list) {

src/main/java/pl/skidam/automodpack/client/ui/DownloadSelectionScreen.java

@@ -13,6 +13,8 @@
 import pl.skidam.automodpack.client.ui.versioned.VersionedText;
 import pl.skidam.automodpack_loader_core.utils.SelectionManager;
 
+import static pl.skidam.automodpack_core.GlobalVariables.serverConfig;
+
 public class DownloadSelectionScreen extends VersionedScreen {
     private final Screen parent;
     private final ModpackUpdater modpackUpdaterInstance;