dns_1984.hosting.sh: fix logging in by updating session cookie name

Since at least Mar 29 the 1984.hosting server doesn't return
"sessionid" cookie and apparently "cookie1984nammnamm" is used instead
for the same purpose.

This results in errors like this
```
One or more cookies are empty: 'csrftoken=JTAJf2Roxl3bwNynzKKIroBqjzgi8d87', ''.
```
and operation fails.

This patch makes DNS TXT method work again with 1984 hosting.

dnsapi/dns_1984hosting.sh

@@ -128,7 +128,7 @@ _1984hosting_login() {
 
   _get "https://1984.hosting/accounts/login/" | grep "csrfmiddlewaretoken"
   csrftoken="$(grep -i '^set-cookie:' "$HTTP_HEADER" | _egrep_o 'csrftoken=[^;]*;' | tr -d ';')"
-  sessionid="$(grep -i '^set-cookie:' "$HTTP_HEADER" | _egrep_o 'sessionid=[^;]*;' | tr -d ';')"
+  sessionid="$(grep -i '^set-cookie:' "$HTTP_HEADER" | _egrep_o 'cookie1984nammnamm=[^;]*;' | tr -d ';')"
 
   if [ -z "$csrftoken" ] || [ -z "$sessionid" ]; then
     _err "One or more cookies are empty: '$csrftoken', '$sessionid'."
@@ -145,7 +145,7 @@ _1984hosting_login() {
   _debug2 response "$response"
 
   if _contains "$response" '"loggedin": true'; then
-    One984HOSTING_SESSIONID_COOKIE="$(grep -i '^set-cookie:' "$HTTP_HEADER" | _egrep_o 'sessionid=[^;]*;' | tr -d ';')"
+    One984HOSTING_SESSIONID_COOKIE="$(grep -i '^set-cookie:' "$HTTP_HEADER" | _egrep_o 'cookie1984nammnamm=[^;]*;' | tr -d ';')"
     One984HOSTING_CSRFTOKEN_COOKIE="$(grep -i '^set-cookie:' "$HTTP_HEADER" | _egrep_o 'csrftoken=[^;]*;' | tr -d ';')"
     export One984HOSTING_SESSIONID_COOKIE
     export One984HOSTING_CSRFTOKEN_COOKIE