BUG: Hexbin plots does not display x label and xtick labels in pandas 1.3.3
### 

- [X] I have checked that this issue has not already been reported.

- [X] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsnew/index.html) of pandas.

- [ ] I have confirmed this bug exists on the master branch of pandas.


### Reproducible Example

```python
import pandas as pd
import numpy as np
df = pd.DataFrame(np.random.rand(1000, 2), columns=['a', 'b'])
df.plot.hexbin(x='a', y='b');
#thanks @rabernat
```


### Issue Description

Hexbin plots does not display x label and xtick labels. This has been a bug in the past, see closed issue #10678 , it must have been fixed with #20446 and must have been introduced again later.

### Expected Behavior

Expect to see 'a' as the x label and numbers under the x axis ticks. This is only achievable with workaround:
```python
import pandas as pd
import numpy as np
df = pd.DataFrame(np.random.rand(1000, 2), columns=['a', 'b'])
df.plot.hexbin(x='a', y='b',sharex=False);
```

### Installed Versions

<details>

INSTALLED VERSIONS
------------------
commit           : 73c68257545b5f8530b7044f56647bd2db92e2ba
python           : 3.7.10.final.0
python-bits      : 64
OS               : Linux
OS-release       : 4.19.0-18-cloud-amd64
Version          : #1 SMP Debian 4.19.208-1 (2021-09-29)
machine          : x86_64
processor        : 
byteorder        : little
LC_ALL           : None
LANG             : C.UTF-8
LOCALE           : en_US.UTF-8

pandas           : 1.3.3
numpy            : 1.19.5
pytz             : 2021.3
dateutil         : 2.8.2
pip              : 21.2.4
setuptools       : 58.2.0
Cython           : None
pytest           : None
hypothesis       : None
sphinx           : None
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : None
html5lib         : None
pymysql          : None
psycopg2         : None
jinja2           : 3.0.2
IPython          : 7.28.0
pandas_datareader: None
bs4              : None
bottleneck       : 1.3.2
fsspec           : 2021.10.0
fastparquet      : None
gcsfs            : 2021.10.0
matplotlib       : 3.4.3
numexpr          : None
odfpy            : None
openpyxl         : None
pandas_gbq       : None
pyarrow          : 5.0.0
pyxlsb           : None
s3fs             : None
scipy            : 1.7.1
sqlalchemy       : 1.4.25
tables           : None
tabulate         : None
xarray           : None
xlrd             : None
xlwt             : None
numba            : 0.54.1
</details>
