Move ProxyManager.proxyProperty initialization to init()

HMCL/src/main/java/org/jackhuang/hmcl/setting/ProxyManager.java

@@ -35,7 +35,18 @@ public final class ProxyManager {
     private ProxyManager() {
     }
 
-    private static ObjectBinding<Proxy> proxyProperty = Bindings.createObjectBinding(
+    private static ObjectBinding<Proxy> proxyProperty;
+
+    public static Proxy getProxy() {
+        return proxyProperty.get();
+    }
+
+    public static ObservableObjectValue<Proxy> proxyProperty() {
+        return proxyProperty;
+    }
+
+    static void init() {
+        proxyProperty = Bindings.createObjectBinding(
                 () -> {
                     String host = config().getProxyHost();
                     Integer port = Lang.toIntOrNull(config().getProxyPort());
@@ -50,21 +61,10 @@ public final class ProxyManager {
                 config().proxyPortProperty(),
                 config().hasProxyProperty());
 
-    public static Proxy getProxy() {
+        proxyProperty.addListener(any -> updateSystemProxy());
-        return proxyProperty.get();
-    }
-
-    public static ObservableObjectValue<Proxy> proxyProperty() {
-        return proxyProperty;
-    }
-
-    static void init() {
-        proxyProperty.addListener(observable -> updateSystemProxy());
-
         updateSystemProxy();
 
         Authenticator.setDefault(new Authenticator() {
-
             @Override
             protected PasswordAuthentication getPasswordAuthentication() {
                 if (config().hasProxyAuth()) {