t4205 (log-pretty-format): use `tformat` rather than `format`
t4205 (log-pretty-format): use `tformat` rather than `format`

Use `tformat` to avoid using of `echo` to complete end of line.

Signed-off-by: Alexey Shumkin <70ce441afc331494339d12ae4e80ae971824f823@gmail.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git