FF150 img/HTMLImageElement sizes auto value

Author: hamishwillee

api/HTMLImageElement.json

@@ -1110,8 +1110,7 @@
               "chrome_android": "mirror",
               "edge": "mirror",
               "firefox": {
-                "version_added": "150",
-                "impl_url": "https://bugzil.la/1819581"
+                "version_added": "150"
               },
               "firefox_android": "mirror",
               "oculus": "mirror",

html/elements/img.json

@@ -782,8 +782,7 @@
                 "chrome_android": "mirror",
                 "edge": "mirror",
                 "firefox": {
-                  "version_added": false,
-                  "impl_url": "https://bugzil.la/1819581"
+                  "version_added": "150"
                 },
                 "firefox_android": "mirror",
                 "oculus": "mirror",