IsAdmin was the one derived AccountRecord field computed inline in the
struct literal, while Crisp's roles and full name already go through
helpers and the sibling Yousign driver uses a yousignIsAdmin helper. Move
it to crispIsAdmin for consistency; behaviour is unchanged (only the
website owner is an administrator).
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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