feat: add plugin download url

app/src/main/java/com/stardust/scriptdroid/Pref.java

@@ -100,8 +100,6 @@ public class Pref {
                 }
                 def().edit().putLong(KEY_LAST_SHOW_AD_MILLIS, System.currentTimeMillis()).apply();
                 return true;
-            case "Off":
-                return false;
         }
         return true;
     }

app/src/main/java/com/stardust/scriptdroid/ui/build/BuildActivity.java

@@ -100,7 +100,7 @@ public class BuildActivity extends BaseActivity implements AutoJsApkBuilder.Prog
     }
 
     private void downloadPlugin() {
-        // TODO: 2017/11/29
+        IntentUtil.browse(this, "https://www.autojs.org/topic/977");
     }
 
     private void setupWithSourceFile(ScriptFile file) {

autojs/src/main/res/values/arrays.xml

@@ -5,13 +5,11 @@
     <string-array name="ad_showing_mode_keys">
         <item>默认</item>
         <item>每天显示一次</item>
-        <item>关闭广告</item>
     </string-array>
 
     <string-array name="ad_showing_mode_values">
         <item>Default</item>
         <item>OncePerDay</item>
-        <item>Off</item>
     </string-array>