[ie/Rule34Video] Fix `_VALID_URL` (#9044)

Authored by: gmes78

yt_dlp/extractor/rule34video.py

@@ -18,10 +18,10 @@ from ..utils.traversal import traverse_obj
 
 
 class Rule34VideoIE(InfoExtractor):
-    _VALID_URL = r'https?://(?:www\.)?rule34video\.com/videos/(?P<id>\d+)'
+    _VALID_URL = r'https?://(?:www\.)?rule34video\.com/videos?/(?P<id>\d+)'
     _TESTS = [
         {
-            'url': 'https://rule34video.com/videos/3065157/shot-it-mmd-hmv/',
+            'url': 'https://rule34video.com/video/3065157/shot-it-mmd-hmv/',
             'md5': 'ffccac2c23799dabbd192621ae4d04f3',
             'info_dict': {
                 'id': '3065157',