BIP 9: Misplaced table cells typo

Second row was created with an incorrect extra empty cell

Author: Alegege

bip-0009/assignments.mediawiki

@@ -30,7 +30,6 @@ State can be defined, active, failed. Dates are in UTC.
 | 2016-11-15 00:00:00
 | 2017-11-15 00:00:00
 | active since #481824
-| -
 | 2016-05-01 00:00:00
 | 2017-05-01 00:00:00
 | active since #834624