Fix bug with some Imgur extensions

bdfr/site_downloaders/imgur.py

@@ -71,6 +71,7 @@ class Imgur(BaseDownloader):
 
     @staticmethod
     def _validate_extension(extension_suffix: str) -> str:
+        extension_suffix = extension_suffix.strip('?1')
         possible_extensions = ('.jpg', '.png', '.mp4', '.gif')
         selection = [ext for ext in possible_extensions if ext == extension_suffix]
         if len(selection) == 1: