Re-add trailing spaces in preseed.cfg

Trailing spaces are meaningful, they are a separator between the type
of the field and the empty value that follows!

kali-config/common/includes.installer/preseed.cfg

@@ -11,7 +11,7 @@ d-i mirror/http/hostname string http.kali.org
 d-i mirror/http/directory string /kali
 
 # Disable security, updates and backports
-d-i apt-setup/services-select multiselect
+d-i apt-setup/services-select multiselect 
 
 # Enable contrib and non-free
 d-i apt-setup/non-free boolean true
@@ -52,7 +52,7 @@ popularity-contest popularity-contest/participate boolean false
 console-setup console-setup/charmap47 select UTF-8
 samba-common samba-common/dhcp boolean false
 macchanger macchanger/automatically_run boolean false
-kismet-capture-common kismet-capture-common/install-users string
+kismet-capture-common kismet-capture-common/install-users string 
 kismet-capture-common kismet-capture-common/install-setuid boolean true
 wireshark-common wireshark-common/install-setuid boolean true
 sslh sslh/inetd_or_standalone select standalone