json_normalize throws `TypeError` with list `record_path`
#### Code Sample, a copy-pastable example if possible

```python
from pandas.io.json import json_normalize

json_normalize({'A': {'B': [{'X': 1, 'Y': 2}, {'X': 3, 'Y': 4}]}}, ['A', 'B'])
```
Note: change from `json_normalize({'A': {'B': [1, 2]}}, ['A', 'B'])` to distinguish from #21608 

#### Problem description
The above code throws a `TypeError`:
```
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python36\lib\site-packages\pandas\io\json\normalize.py", line 257, in json_normalize
    _recursive_extract(data, record_path, {}, level=0)
  File "C:\Python36\lib\site-packages\pandas\io\json\normalize.py", line 230, in _recursive_extract
    seen_meta, level=level + 1)
  File "C:\Python36\lib\site-packages\pandas\io\json\normalize.py", line 233, in _recursive_extract
    recs = _pull_field(obj, path[0])
  File "C:\Python36\lib\site-packages\pandas\io\json\normalize.py", line 180, in _pull_field
    result = result[spec]
TypeError: string indices must be integers
```
#### Expected Output
| |X|Y|
|-|-|-|
|0|1|2|
|1|3|4|
#### Output of ``pd.show_versions()``

<details>
INSTALLED VERSIONS
------------------
commit: None
python: 3.6.4.final.0
python-bits: 64
OS: Windows
OS-release: 10
machine: AMD64
processor: Intel64 Family 6 Model 62 Stepping 4, GenuineIntel
byteorder: little
LC_ALL: None
LANG: None
LOCALE: None.None

pandas: 0.23.1
pytest: 3.6.1
pip: 10.0.1
setuptools: 28.8.0
Cython: None
numpy: 1.14.2
scipy: None
pyarrow: None
xarray: None
IPython: 6.3.1
sphinx: None
patsy: None
dateutil: 2.7.2
pytz: 2018.4
blosc: None
bottleneck: None
tables: None
numexpr: None
feather: None
matplotlib: None
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: 4.6.0
html5lib: 1.0.1
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: 2.10
s3fs: None
fastparquet: None
pandas_gbq: None
pandas_datareader: None
</details>
