remove '&' from URL patterns

'/?&#' -> '/?#' and '?&#' -> '?#'

According to https://www.ietf.org/rfc/rfc3986.txt, URLs are
"organized hierarchically" by using "the slash ("/"), question
mark ("?"), and number sign ("#") characters to delimit components"

gallery_dl/extractor/inkbunny.py

@@ -60,7 +60,7 @@ class InkbunnyExtractor(Extractor):
 class InkbunnyUserExtractor(InkbunnyExtractor):
     """Extractor for inkbunny user profiles"""
     subcategory = "user"
-    pattern = BASE_PATTERN + r"/(?!s/)(gallery/|scraps/)?([^/?&#]+)"
+    pattern = BASE_PATTERN + r"/(?!s/)(gallery/|scraps/)?([^/?#]+)"
     test = (
         ("https://inkbunny.net/soina", {
             "pattern": r"https://[\w.]+\.metapix\.net/files/full"