Remove FunctionTypeAlias in _isFunctionalParameter().

It is not a type, but a node.

R=brianwilkerson@google.com

Change-Id: I603e958dda3c2486285a57bc23f2fd37491105f4
Reviewed-on: https://dart-review.googlesource.com/c/92528
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
diff --git a/pkg/analyzer_plugin/lib/src/utilities/completion/completion_target.dart b/pkg/analyzer_plugin/lib/src/utilities/completion/completion_target.dart
index 69a0aae..fa3edbe 100644
--- a/pkg/analyzer_plugin/lib/src/utilities/completion/completion_target.dart
+++ b/pkg/analyzer_plugin/lib/src/utilities/completion/completion_target.dart
@@ -575,6 +575,6 @@
         paramType = param.type;
       }
     }
-    return paramType is FunctionType || paramType is FunctionTypeAlias;
+    return paramType is FunctionType;
   }
 }