Remove DNS records for AWS SES for mission-patch.com

I just removed the mission-patch.com AWS SES identity from the
`eu-west-1` region. These DNS records relate to that identity. This
identities was probably originally used to send emails from the Mission
Patch app. However, some time ago we switched to using Postmark to send
emails, so it is no longer needed and we can remove the associated DNS
records.

Note that I have left the `_dmarc.mission-patch.com` TXT record in
place, because (a) it doesn't seem specific to AWS SES (i.e. it _might_
relate to other email sending from this domain); and (b) the value is
different to that in the AWS console: "v=DMARC1; p=none;".

config/zones/mission-patch.com

@@ -1,19 +1,13 @@
 $ORIGIN mission-patch.com.
 $TTL 1h
-mission-patch.com. 3600 IN SOA ns1.dnsimple.com. admin.dnsimple.com. 1547902562 86400 7200 604800 300
+mission-patch.com. 3600 IN SOA ns1.dnsimple.com. admin.dnsimple.com. 1547902569 86400 7200 604800 300
 mission-patch.com. 3600 IN NS ns1.dnsimple.com.
 mission-patch.com. 3600 IN NS ns2.dnsimple.com.
 mission-patch.com. 3600 IN NS ns3.dnsimple.com.
 mission-patch.com. 3600 IN NS ns4.dnsimple.com.
-_amazonses.mission-patch.com. 3600 IN TXT "7IOzpzI23l95v4PU2mEB9QawiT+zBz1SQzjO7cPlvQk="
 _dmarc.mission-patch.com. 3600 IN TXT "v=DMARC1;p=quarantine;pct=100;fo=1"
 ; mission-patch.com. 3600 IN ALIAS mission-patch-web-l6ws.onrender.com.
-kj6owdu3m7opqpaqdthxlsdn7ws6q4lo._domainkey.mission-patch.com. 3600 IN CNAME kj6owdu3m7opqpaqdthxlsdn7ws6q4lo.dkim.amazonses.com.
-pi4nhn5n745qtvshl3pntd5crochzvam._domainkey.mission-patch.com. 3600 IN CNAME pi4nhn5n745qtvshl3pntd5crochzvam.dkim.amazonses.com.
-z3tjfs5wm7xqgzhp5nn5ayesiy73ydv4._domainkey.mission-patch.com. 3600 IN CNAME z3tjfs5wm7xqgzhp5nn5ayesiy73ydv4.dkim.amazonses.com.
-mission-patch.com. 3600 IN TXT "v=spf1 include:amazonses.com ~all include:mailgun.org"
-mail.mission-patch.com. 3600 IN MX 10 feedback-smtp.eu-west-1.amazonses.com.
-mail.mission-patch.com. 3600 IN TXT "v=spf1 include:amazonses.com ~all"
+mission-patch.com. 3600 IN TXT "v=spf1 include:mailgun.org ~all"
 mission-patch.com. 3600 IN TXT "stripe-verification=43d16cbf8a47a2f56a7eb952f29b152e74bd15d4f9d1100b906db6d020d50838"
 zvpfrp7bbnkfesgeoy7jkpv2cpfdmpwv._domainkey.mission-patch.com. 3600 IN CNAME zvpfrp7bbnkfesgeoy7jkpv2cpfdmpwv.dkim.custom-email-domain.stripe.com.
 dlmldpwu6nv5o7celbyauryrxihohdco._domainkey.mission-patch.com. 3600 IN CNAME dlmldpwu6nv5o7celbyauryrxihohdco.dkim.custom-email-domain.stripe.com.