fix credo warning for is_already_admin?

lib/memex/accounts.ex

@@ -422,16 +422,16 @@ defmodule Memex.Accounts do
 
   ## Examples
 
-      iex> is_already_admin?(%User{role: :admin})
+      iex> already_admin?(%User{role: :admin})
       true
 
-      iex> is_already_admin?(%User{})
+      iex> already_admin?(%User{})
       false
 
   """
-  @spec is_already_admin?(User.t() | nil) :: boolean()
-  def is_already_admin?(%User{role: :admin}), do: true
-  def is_already_admin?(_invalid_user), do: false
+  @spec already_admin?(User.t() | nil) :: boolean()
+  def already_admin?(%User{role: :admin}), do: true
+  def already_admin?(_invalid_user), do: false
 
   ## Confirmation
 

lib/memex_web/components/core_components/topbar.html.heex

@@ -38,7 +38,7 @@
       <li class="mx-2 my-1 border-left border border-primary-700">​</li>
 
       <%= if @current_user do %>
-        <li :if={@current_user |> Accounts.is_already_admin?()} class="mx-2 my-1">
+        <li :if={@current_user |> Accounts.already_admin?()} class="mx-2 my-1">
           <.link navigate={~p"/invites"} class="text-primary-400 hover:underline">
             <%= gettext("invites") %>
           </.link>