KNNImputer add_indicator fails to persist where missing data had been present in training

### Describe the bug

Hello, I've encountered an issue where the KNNImputer fails to record the fields where there were missing data at the time when `.fit` is called, but not recognised if `.transform` is called on a dense matrix. I would have expected it to return a 2x3 matrix rather than 2x2, with `missingindicator_A = False` for all cases.

Reproduction steps below. Any help much appreciated :)

### Steps/Code to Reproduce

```python
>>> import pandas as pd
>>> from sklearn.impute import KNNImputer
>>> knn = KNNImputer(add_indicator=True)
>>> df = pd.DataFrame({'A': [0, None], 'B': [1, 2]})
>>> df
     A  B
0  0.0  1
1  NaN  2
>>> knn.fit(df)
KNNImputer(add_indicator=True)
>>> pd.DataFrame(knn.transform(df), columns=knn.get_feature_names_out())
     A    B  missingindicator_A
0  0.0  1.0                 0.0
1  0.0  2.0                 1.0
>>> df['A'] = 0
>>> pd.DataFrame(knn.transform(df), columns=knn.get_feature_names_out())
```

### Expected Results

```
     A    B  missingindicator_A
0  0.0  1.0                 0.0
1  0.0  2.0                 0.0
```

### Actual Results

```pytb
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
Cell In[30], line 1
----> 1 pd.DataFrame(knn.transform(df), columns=knn.get_feature_names_out())

File /opt/conda/lib/python3.10/site-packages/pandas/core/frame.py:694, in DataFrame.__init__(self, data, index, columns, dtype, copy)
    684         mgr = dict_to_mgr(
    685             # error: Item "ndarray" of "Union[ndarray, Series, Index]" has no
    686             # attribute "name"
   (...)
    691             typ=manager,
    692         )
    693     else:
--> 694         mgr = ndarray_to_mgr(
    695             data,
    696             index,
    697             columns,
    698             dtype=dtype,
    699             copy=copy,
    700             typ=manager,
    701         )
    703 # For data is list-like, or Iterable (will consume into list)
    704 elif is_list_like(data):

File /opt/conda/lib/python3.10/site-packages/pandas/core/internals/construction.py:351, in ndarray_to_mgr(values, index, columns, dtype, copy, typ)
    346 # _prep_ndarray ensures that values.ndim == 2 at this point
    347 index, columns = _get_axes(
    348     values.shape[0], values.shape[1], index=index, columns=columns
    349 )
--> 351 _check_values_indices_shape_match(values, index, columns)
    353 if typ == "array":
    355     if issubclass(values.dtype.type, str):

File /opt/conda/lib/python3.10/site-packages/pandas/core/internals/construction.py:422, in _check_values_indices_shape_match(values, index, columns)
    420 passed = values.shape
    421 implied = (len(index), len(columns))
--> 422 raise ValueError(f"Shape of passed values is {passed}, indices imply {implied}")

ValueError: Shape of passed values is (2, 2), indices imply (2, 3)
```

### Versions

```shell
python3, sklearn = 1.2.1
```

COMMENT:
Currently `transform `method of `KNNImputer` returns input `X `without adding missing columns, if there are no missing values in `X `regardless of wether there are `missing_indicators `or not . I think it needs to be fixed

https://github.com/scikit-learn/scikit-learn/blob/21312644df0a6b4c6f3c27a74ac9d26cf49c2304/sklearn/impute/_knn.py#L272-L286

Labels: Bug