Correct whitespace option is passed to 'Show All Lines' request.

Summary:
Expanding lines duplicated some lines occasionally, because whitespace
option was different for the original request and the following request.

Test Plan:
Tested that the broken changeset was correct now.

Reviewed By: epriestley
Reviewers: epriestley
CC: jungejason, aran, epriestley
Differential Revision: 263