cmd/upspinserver: run gofmt on web.go
cmd/upspinserver: run gofmt on web.go

No functional changes.

Change-Id: I8bd6ae21bdf91962485e705ef0ea148c61327dfe
Reviewed-on: https://upspin-review.googlesource.com/8442
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

upspin/upspin,upspin/upspin