BUG: MultiIndex.__repr__ is broken when `display.max_seq_items` = 1
- [x] I have checked that this issue has not already been reported.

- [x] I have confirmed this bug exists on the latest version of pandas.

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

---

**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
In[11]: pd.set_option("display.max_seq_items", 2)
In[12]: pd.MultiIndex.from_tuples(tuples)
Out[12]: 
MultiIndex([(1,  'red'),
            ...
            (2, 'blue')],
           length=40)
In[13]: tuples = [(1, 'red'), (1, 'blue'), (2, 'red'), (2, 'blue')]
In[14]: pd.MultiIndex.from_tuples(tuples)
Out[14]: 
MultiIndex([(1,  'red'),
            ...
            (2, 'blue')],
           length=4)
In[15]: pd.set_option("display.max_seq_items", 1)
In[16]: pd.MultiIndex.from_tuples(tuples)
Out[16]: 
MultiIndex([...
            (1,  'red'),
            (1, 'blue'),
            (2,  'red'),
            (2, 'blue')],
           length=4)
```

#### Problem description

The output of `MultiIndex.__repr__` is dependent on `display.max_seq_items`, the output is correct for different values of `max_seq_items` except when it is set to 1. When it is set to 1, the entire records in MultiIndex are being printed and also `"..."` are being prepended to the data output.



#### Expected Output
```python
In[12]: pd.MultiIndex.from_tuples(tuples)
Out[12]: 
MultiIndex([(1,  'red'),
            ...],
           length=40)
```

#### Output of ``pd.show_versions()``

<details>

INSTALLED VERSIONS
------------------
commit           : b5958ee1999e9aead1938c0bba2b674378807b3d
python           : 3.7.9.final.0
python-bits      : 64
OS               : Linux
OS-release       : 5.4.0-53-generic
Version          : #59-Ubuntu SMP Wed Oct 21 09:38:44 UTC 2020
machine          : x86_64
processor        : x86_64
byteorder        : little
LC_ALL           : None
LANG             : en_US.UTF-8
LOCALE           : en_US.UTF-8
pandas           : 1.1.5
numpy            : 1.19.4
pytz             : 2020.4
dateutil         : 2.8.1
pip              : 20.3.1
setuptools       : 49.6.0.post20201009
Cython           : 0.29.21
pytest           : 6.1.2
hypothesis       : 5.43.3
sphinx           : 3.3.1
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : None
html5lib         : None
pymysql          : None
psycopg2         : None
jinja2           : 2.11.2
IPython          : 7.19.0
pandas_datareader: None
bs4              : None
bottleneck       : None
fsspec           : 0.8.4
fastparquet      : None
gcsfs            : None
matplotlib       : None
numexpr          : None
odfpy            : None
openpyxl         : None
pandas_gbq       : None
pyarrow          : 1.0.1
pytables         : None
pyxlsb           : None
s3fs             : None
scipy            : None
sqlalchemy       : None
tables           : None
tabulate         : None
xarray           : None
xlrd             : None
xlwt             : None
numba            : 0.52.0

</details>
