Code clean and allow refresh pages

app/src/main/java/com/hippo/ehviewer/widget/GalleryInfoContentHelper.java

@@ -86,6 +86,8 @@ public abstract class GalleryInfoContentHelper extends ContentLayout.ContentHelp
     @Override
     protected void onClearData() {
         map.clear();
+        maxGid = -1;
+        minGid = -1;
     }
 
     @Override