text: Title: MultiIndex dropped by reset_index with default argument
  Body: **Describe the bug**
  A clear and concise description of what the bug is.
  
  - [X] I have checked that this issue has not already been reported.
  - [X] I have confirmed this bug exists on the latest version of pandera.
  - [ ] (optional) I have confirmed this bug exists on the master branch of pandera.
  
  **Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports) detailing how to provide the necessary information for us to reproduce your bug.
  
  #### Code Sample, a copy-pastable example
  
  ```python
  import pandera as pa
  multi_index = pa.DataFrameSchema(
      columns={"test_col": pa.Column(int)},
      index=pa.MultiIndex([pa.Index(int, name="index_1"), pa.Index(int, name="index_2")]),
  )
  single_index = pa.DataFrameSchema(
      columns={"test_col": pa.Column(int)}, index=pa.Index(int, name="index_1")
  )
  print(multi_index)
  print("-----")
  print(single_index)
  print("-----")
  print("-----")
  print(multi_index.reset_index())
  print("-----")
  print(single_index.reset_index())
  # By contrast, this will work as expected:
  print("-----")
  print(multi_index.reset_index(["index_1", "index_2"]))
  ```
  
  #### Expected behavior
  The indices to become columns.
  
  #### Actual behavior
  The MultiIndex is completely dropped without being added to the columns.
  
  #### Desktop (please complete the following information):
   - OS: Win10
   - Python 3.9.12
  
  #### Screenshots
  ![image](https://user-images.githubusercontent.com/10162554/170385676-a33be121-e867-4814-8440-fc2afbfe8f06.png)
  
  ![image](https://user-images.githubusercontent.com/10162554/170386243-318b6215-9501-43bf-af1f-932f8a1263ee.png)
  
  #### Additional context
  Found in pandera-0.9.0
  Exists as recently as pandera-0.11.0