fix(register): use a valid default avatar figure

The starter look for a new account was `hr-100-.hd-180-1...`, whose empty
hair colour slot is rejected by the imager with 400 "Invalid figure format".
Every player who registered without a look therefore got a broken avatar.
Add the missing colour slot (`hr-100-1`), which the imager renders.

src/actions/register.ts

@@ -169,7 +169,10 @@ const ZOD_MESSAGE_CODES: Record<string, RegisterErrorCode> = {
 };
 
 // A valid starter Habbo figure so the avatar renders in-client immediately.
-const DEFAULT_LOOK = "hr-100-.hd-180-1.ch-255-66.lg-280-110.sh-305-62";
+// The hair part needs a colour slot (`hr-100-1`, not `hr-100-`) or the imager
+// rejects the whole figure with 400 "Invalid figure format" and every avatar
+// for the user renders broken.
+const DEFAULT_LOOK = "hr-100-1.hd-180-1.ch-255-66.lg-280-110.sh-305-62";
 
 export interface RegisterState {
 	error: string | null;