Remove info extraction from json_ld

Aparat uses an invalid ld+json format in some pages, and it causes to
JSON parser errors in some URLs, so it is better to get title and
description from og instead of ld+json

youtube_dl/extractor/aparat.py

@@ -20,11 +20,7 @@ class AparatIE(InfoExtractor):
             'id': 'wP8On',
             'ext': 'mp4',
             'title': 'تیم گلکسی 11 - زومیت',
-            'description': 'md5:096bdabcdcc4569f2b8a5e903a3b3028',
-            'duration': 231,
-            'timestamp': 1387394859,
-            'upload_date': '20131218',
-            'view_count': int,
+            'description': 'md5:096bdabcdcc4569f2b8a5e903a3b3028'
         },
     }, {
         # multiple formats
@@ -80,14 +76,14 @@ class AparatIE(InfoExtractor):
         self._sort_formats(
             formats, field_preference=('height', 'width', 'tbr', 'format_id'))
 
-        info = self._search_json_ld(webpage, video_id, default={})
+        title = self._og_search_title(webpage)
+        description = self._og_search_description(webpage)
 
-        if not info.get('title'):
-            info['title'] = options['title']
-
-        return merge_dicts(info, {
+        return {
+            'title': title,
+            'description': description,
             'id': video_id,
             'thumbnail': url_or_none(options.get('poster')),
             'duration': int_or_none(options.get('duration')),
             'formats': formats,
-        })
+        }