[mastodon] support '/statuses' URLs (#7255)

- /statuses/123456789
- /users/USER/statuses/123456789

gallery_dl/extractor/mastodon.py

@@ -196,7 +196,8 @@ class MastodonFollowingExtractor(MastodonExtractor):
 class MastodonStatusExtractor(MastodonExtractor):
     """Extractor for images from a status"""
     subcategory = "status"
-    pattern = BASE_PATTERN + r"/@[^/?#]+/(?!following)([^/?#]+)"
+    pattern = (BASE_PATTERN + r"/(?:@[^/?#]+|(?:users/[^/?#]+/)?statuses)"
+               r"/(?!following)([^/?#]+)")
     example = "https://mastodon.social/@USER/12345"
 
     def statuses(self):

test/results/mastodonsocial.py

@@ -160,10 +160,25 @@ __tests__ = (
     "#class"   : mastodon.MastodonStatusExtractor,
     "#count"   : 4,
 
+    "account": {
+        "acct": "jk",
+    },
     "count": 4,
     "num"  : int,
 },
 
+{
+    "#url"     : "https://mastodon.social/statuses/103794036899778366",
+    "#category": ("mastodon", "mastodon.social", "status"),
+    "#class"   : mastodon.MastodonStatusExtractor,
+},
+
+{
+    "#url"     : "https://mastodon.social/users/jk/statuses/103794036899778366",
+    "#category": ("mastodon", "mastodon.social", "status"),
+    "#class"   : mastodon.MastodonStatusExtractor,
+},
+
 {
     "#url"     : "https://mastodon.social/@technewsbot@assortedflotsam.com/112360601113258881",
     "#comment" : "card image",