make untyped-decorator not a sub cose of misc, per suggestion

Author: wyattscarpenter

mypy/errorcodes.py

@@ -306,7 +306,6 @@ def __hash__(self) -> int:
     "untyped-decorator",
     "Error if an untyped decorator makes a typed function untyped",
     "General",
-    sub_code_of=MISC,
 )
 
 NARROWED_TYPE_NOT_SUBTYPE: Final = ErrorCode(

test-data/unit/check-errorcodes.test

@@ -404,7 +404,7 @@ def x() -> int: return 1
 def y() -> int: return 2
 @d # type: ignore[untyped-decorator]
 def best() -> int: return 3
-@d # type: ignore[misc]  # E: Unused "type: ignore" comment, use narrower [untyped-decorator] instead of [misc] code  [unused-ignore]
+@d  # E: Untyped decorator makes function "z" untyped  [untyped-decorator]
 def z() -> int: return 4
 
 [case testErrorCodeIndexing]