LibWeb: Remove default value from CredentialRequestOptions.password

This is probably a spec bug. If the property has a default value it will
always be populated in the `CredentialRequestOptions` dictionary making
that credential type always active.

Libraries/LibWeb/CredentialManagement/PasswordCredential.idl

@@ -9,7 +9,9 @@ interface PasswordCredential : Credential {
 PasswordCredential includes CredentialUserData;
 
 partial dictionary CredentialRequestOptions {
-    boolean password = false;
+    // FIXME: Spec bug?
+    // boolean password = false;
+    boolean password;
 };
 
 dictionary PasswordCredentialData : CredentialData {