fix bug from review, which also resolves confusion with unexpected test passing

Author: jakkdl

flake8_async/visitors/visitor_utility.py

@@ -118,7 +118,7 @@ def __init__(self, *args: Any, **kwargs: Any):
         if self.options.anyio:
             self.add_library("anyio")
         if self.options.asyncio:
-            self.add_library("anyio")
+            self.add_library("asyncio")
 
     def visit_Import(self, node: ast.Import):
         for alias in node.names:

tests/eval_files/anyio_trio.py

@@ -1,8 +1,8 @@
 # type: ignore
 # ARG --enable=ASYNC220
 # NOTRIO
+# NOASYNCIO
 # BASE_LIBRARY anyio
-# TODO: why does this pass with --asyncio
 
 # anyio eval will automatically prepend this test with `--anyio`
 import trio  # isort: skip