remove unused parameter from make_formatter

src/flake8/api/legacy.py

@@ -158,8 +158,7 @@ class StyleGuide:
                 "Report should be subclass of "
                 "flake8.formatter.BaseFormatter."
             )
-        self._application.formatter = None
-        self._application.make_formatter(reporter)
+        self._application.formatter = reporter(self.options)
         self._application.guide = None
         # NOTE(sigmavirus24): This isn't the intended use of
         # Application#make_guide but it works pretty well.

src/flake8/main/application.py

@@ -10,7 +10,6 @@ from typing import Optional
 from typing import Sequence
 from typing import Set
 from typing import Tuple
-from typing import Type
 
 import flake8
 from flake8 import checker
@@ -183,9 +182,7 @@ class Application:
             except TypeError:
                 parse_options(self.options)
 
-    def make_formatter(
-        self, formatter_class: Optional[Type[BaseFormatter]] = None
-    ) -> None:
+    def make_formatter(self) -> None:
         """Initialize a formatter based on the parsed options."""
         assert self.plugins is not None
         assert self.options is not None

tests/unit/test_legacy_api.py

@@ -122,7 +122,7 @@ def test_styleguide_init_report():
             raise NotImplementedError
 
     style_guide.init_report(FakeFormatter)
-    app.make_formatter.assert_called_once_with(FakeFormatter)
+    assert isinstance(app.formatter, FakeFormatter)
     assert app.guide is None
     app.make_guide.assert_called_once_with()