Rewrite dict literal for files in pandas/tests/frame
- [ ] xref #38138
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry
identify unnecessary dict call - rewrite as a literal
Rewrites as dictionary literals for the following files:

	modified:   pandas/tests/frame/indexing/test_indexing.py
	modified:   pandas/tests/frame/indexing/test_where.py
	modified:   pandas/tests/frame/methods/test_fillna.py
	modified:   pandas/tests/frame/methods/test_sort_values.py
	modified:   pandas/tests/frame/methods/test_to_csv.py
	modified:   pandas/tests/frame/methods/test_to_records.py
	modified:   pandas/tests/frame/test_arithmetic.py
	modified:   pandas/tests/frame/test_reductions.py

However, I did not change it to literal in the following two places, as they seem like valid dict call:
1. pandas/tests/frame/indexing/test_indexing.py
```
lambda l: dict(zip(l, range(len(l)))),   # line 76
lambda l: dict(zip(l, range(len(l)))).keys(),  # line 77
```
2. pandas/tests/frame/indexing/test_where.py

```
return DataFrame(dict((c, s + 1) if is_ok(s) else (c, s) for c, s in df.items()))  # line 32
```
both of 1 and 2 can be dict-comprehensions. (can do separately).