[mod] result_templates/videos.html: replace embedded HTML by data_src

Embedded HTML breaks SearXNG architecture.  To modularize, HTML is generated in
the templates (oscar & simple) and result parameter 'embedded' is replaced by
'data_src', an URL for embedded content (<iframe>).

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/dailymotion.py

@@ -25,11 +25,6 @@ paging = True
 # search-url
 # see http://www.dailymotion.com/doc/api/obj-video.html
 search_url = 'https://api.dailymotion.com/videos?fields=created_time,title,description,duration,url,thumbnail_360_url,id&sort=relevance&limit=5&page={pageno}&{query}'  # noqa
-embedded_url = (
-    '<iframe frameborder="0" width="540" height="304" '
-    + 'data-src="https://www.dailymotion.com/embed/video/{videoid}" allowfullscreen></iframe>'
-)
-
 supported_languages_url = 'https://api.dailymotion.com/languages'
 
 
@@ -64,7 +59,6 @@ def response(resp):
         content = html_to_text(res['description'])
         thumbnail = res['thumbnail_360_url']
         publishedDate = datetime.fromtimestamp(res['created_time'], None)
-        embedded = embedded_url.format(videoid=res['id'])
 
         # http to https
         thumbnail = thumbnail.replace("http://", "https://")
@@ -76,7 +70,7 @@ def response(resp):
                 'title': title,
                 'content': content,
                 'publishedDate': publishedDate,
-                'embedded': embedded,
+                'data_src': "https://www.dailymotion.com/embed/video/" + res['id'],
                 'thumbnail': thumbnail,
             }
         )