[leasing-server] Fix start email formatting

Bug was introduced in https://skia-review.googlesource.com/c/buildbot/+/247304

Bug: skia:9519
Change-Id: I48a73ea5768a680871b07bb3beb4da9608f2ce04
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/251700
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
diff --git a/leasing/go/leasing/mail.go b/leasing/go/leasing/mail.go
index 558d3c1..a91729a 100644
--- a/leasing/go/leasing/mail.go
+++ b/leasing/go/leasing/mail.go
@@ -66,7 +66,6 @@
 		Your <a href="%s">leasing task</a> has been picked up by the swarming bot <a href="%s">%s</a>.
 		<br/><br/>
 		%s
-		%s
 		Please see <a href="%s">this page</a> for instructions on how to connect to the bot.
 		<br/>
 		Contact the CC'ed trooper if you have any questions.