fix actionban/unban ip definition syntax

config/action.d/nftables-common.conf

@@ -65,7 +65,7 @@ actioncheck = <nftables> list chain <table_family> f2b-table f2b-chain | grep -q
 # Tags:    See jail.conf(5) man page
 # Values:  CMD
 #
-actionban = <nftables> add element <table_family> f2b-table <addr_set> <ip>
+actionban = <nftables> add element <table_family> f2b-table <addr_set> { <ip> }
 
 # Option:  actionunban
 # Notes.:  command executed when unbanning an IP. Take care that the
@@ -73,7 +73,7 @@ actionban = <nftables> add element <table_family> f2b-table <addr_set> <ip>
 # Tags:    See jail.conf(5) man page
 # Values:  CMD
 #
-actionunban = <nftables> delete element <table_family> f2b-table <addr_set> <ip>
+actionunban = <nftables> delete element <table_family> f2b-table <addr_set> { <ip> }
 
 [Init]