Fix loc with slice when the index is monotonically decreasing.

[ueshin]

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[softagram-bot]

Softagram Impact Report for pull/1179 (head commit: fdfdf94)

⚠️ Copy paste found

ℹ️ test_indexing.py: Copy paste fragment inside the same file on lines 566, 584:

                        slice(0, 1)]:
            self.assert_eq(kdf.iloc[:, indexer], pdf.iloc[:, indexer])
            self.assert_eq(kdf.iloc[:1, indexe...(truncated 198 chars)

Now that you are on the file, it would be easier to pay back some tech. debt.

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[codecov-io]

Codecov Report

Merging #1179 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1179      +/-   ##
==========================================
- Coverage   95.29%   95.29%   -0.01%     
==========================================
  Files          35       35              
  Lines        7101     7097       -4     
==========================================
- Hits         6767     6763       -4     
  Misses        334      334

Impacted Files	Coverage Δ
databricks/koalas/indexing.py	95.96% <100%> (-0.05%)	⬇️

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