print space instead of tab
print space instead of tab

Summary: This diff reverts some of the recent changes that printed a tab in front of vectors instead of a single space.

Reviewed By: EdouardGrave

Differential Revision: D4991760

fbshipit-source-id: a81b479f4e946a92071faa44ebe98b2abda6d5c6

facebookresearch/fastText,magicBus234/fastTextJob,facebookresearch/fastText,magicBus234/fastTextJob,facebookresearch/fastText,magicBus234/fastTextJob,facebookresearch/fastText,magicBus234/fastTextJob,facebookresearch/fastText,facebookresearch/fastText