Fix gallery comment parsing

app/src/main/java/com/hippo/ehviewer/client/parser/GalleryDetailParser.java

@@ -397,7 +397,7 @@ public class GalleryDetailParser {
             // time
             Element c3 = JsoupUtils.getElementByClass(element, "c3");
             String temp = c3.ownText();
-            temp = temp.substring("Posted on ".length(), temp.length() - " by:  ".length());
+            temp = temp.substring("Posted on ".length(), temp.length() - " by:".length());
             comment.time = WEB_COMMENT_DATE_FORMAT.parse(temp).getTime();
             // user
             comment.user = c3.child(0).text();