setup: drop redundant configuration of `startup_info->have_repository`

setup: drop redundant configuration of `startup_info->have_repository`

In `init_db()` we set `startup_info->have_repository` twice: once before
reading and applying the repository format and once after. This is
redundant though, as configuring the repository format does not rely on
this variable at all.

Remove the first such site. While at it, fix up formatting a bit.

Signed-off-by: Patrick Steinhardt <redacted>
Signed-off-by: Junio C Hamano <redacted>