homed: make "register" call more friendly

Let's accept full user records (including status and so on) and simply
eat up the parts we don't care about, instead of refusing the whole
record wholesale.

This makes it easier to just copy a user record from one machine and
registering it at another, without stripping the irrelevant parts first.

src/home/homed-manager-bus.c

@@ -488,7 +488,7 @@ static int method_register_home(
 
         assert(message);
 
-        r = bus_message_read_home_record(message, USER_RECORD_LOAD_EMBEDDED|USER_RECORD_PERMISSIVE, &hr, error);
+        r = bus_message_read_home_record(message, USER_RECORD_EXTRACT_EMBEDDED|USER_RECORD_PERMISSIVE, &hr, error);
         if (r < 0)
                 return r;