Add test for absolute paths in checkIgnore

[steveukx]

Extends #1084 to test the use of absolute paths in git.checkIgnore():

Handles the git binary wrapping paths with double quotes, resulting in double \\ separators appearing in the returned values.

Following this change, all paths returned from checkIgnore will be normalized.

const absolute = join( git.revparse('--show-toplevel'), 'node_modules', 'file' );
const relative = join( 'node_modules', 'file' );

const ignored = git.checkIgnore( [ absolute, relative ] );
expect(ignored).toEqual([ absolute, relative ] )

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Latest commit: 0a1c3b5

The changes in this PR will be included in the next version bump.

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Name	Type
simple-git	Minor

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