Revert unrelated ruff style changes from previous commit

Author: nahcmon

Lib/dataclasses.py

@@ -520,7 +520,7 @@ def add_fns_to_class(self, cls):
                 if already_exists and (msg_extra := self.overwrite_errors.get(name)):
                     error_msg = (f'Cannot overwrite attribute {fn.__name__} '
                                  f'in class {cls.__name__}')
-                    if msg_extra is not True:
+                    if not msg_extra is True:
                         error_msg = f'{error_msg} {msg_extra}'
 
                     raise TypeError(error_msg)
@@ -729,14 +729,14 @@ def _frozen_set_del_attr(cls, fields, func_builder):
                         ('self', 'name', 'value'),
                         (f'  if {condition}:',
                           '   raise FrozenInstanceError(f"cannot assign to field {name!r}")',
-                         '  super(__class__, self).__setattr__(name, value)'),
+                         f'  super(__class__, self).__setattr__(name, value)'),
                         locals=locals,
                         overwrite_error=True)
     func_builder.add_fn('__delattr__',
                         ('self', 'name'),
                         (f'  if {condition}:',
                           '   raise FrozenInstanceError(f"cannot delete field {name!r}")',
-                         '  super(__class__, self).__delattr__(name)'),
+                         f'  super(__class__, self).__delattr__(name)'),
                         locals=locals,
                         overwrite_error=True)
 
@@ -1099,7 +1099,7 @@ def _process_class(cls, init, repr, eq, order, unsafe_hash, frozen,
 
     # Do we have any Field members that don't also have annotations?
     for name, value in cls.__dict__.items():
-        if isinstance(value, Field) and name not in cls_annotations:
+        if isinstance(value, Field) and not name in cls_annotations:
             raise TypeError(f'{name!r} is a field but has no type annotation')
 
     # Check rules that apply if we are derived from any dataclasses.