internal/format: fixed test for 32-bit architectures
internal/format: fixed test for 32-bit architectures

doh.

Change-Id: I52d87ebcc49e01e4e418e150ad0101d99a704668
Reviewed-on: https://go-review.googlesource.com/17498
Reviewed-by: Hyang-Ah Hana Kim <d7e82c3c07f92613bcbf9a1e88f6b96c13caa3b0@gmail.com>

cmars/tools,cmars/tools,cmars/tools,golang/text,cmars/tools