Fix Python syntax error in setup_origin.py (#1005)
Fix Python syntax error in setup_origin.py (#1005)

% `flake8 . --count --select=E9,F63,F7,F82,Y --show-source --statistics`
```
./d2l-zh/setup_origin.py:3:13: E999 SyntaxError: invalid decimal literal
commit: 9e55a9c
            ^
./d2l-zh/d2l/tensorflow.py:727:18: F821 undefined name 'get_params'
        params = get_params(len(vocab), num_hiddens)
                 ^
1     E999 SyntaxError: invalid decimal literal
1     F821 undefined name 'get_params'
2
```
d2l-ai/d2l-zh,d2l-ai/d2l-zh,d2l-ai/d2l-zh,mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,mli/gluon-tutorials-zh