LineContinuationBearTest.py: Escape backslash
LineContinuationBearTest.py: Escape backslash

Escape backslash correctly, to act as line continuation operator

Lines 41 and 42 are finally hit and hence
increases LineContinuationBear.py coverage from 92% to 100%

Fixes https://github.com/coala/coala-bears/issues/2866

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