Fix v-unsuspend-mail-account

Fix 'Malformed value "unlimitedM"' after unsuspend mail account

bin/v-unsuspend-mail-account

@@ -48,6 +48,9 @@ is_object_suspended "mail/$domain" 'ACCOUNT' "$account"
 if [[ "$MAIL_SYSTEM" =~ exim ]]; then
     md5=$(get_object_value "mail/$domain" 'ACCOUNT' "$account" '$MD5')
     quota=$(get_object_value "mail/$domain" 'ACCOUNT' "$account" '$QUOTA')
+    if [ "$quota" = 'unlimited' ]; then
+        quota=0
+    fi
     sed -i "/^$account:/d" $HOMEDIR/$user/conf/mail/$domain/passwd
     str="$account:$md5:$user:mail::$HOMEDIR/$user:$quota"
     echo $str >> $HOMEDIR/$user/conf/mail/$domain/passwd