Extend unlinked account check to include "Investment" type

Author: Josh Waldrep

app/views/accounts/_account.html.erb

@@ -33,7 +33,7 @@
           <%= icon("pencil-line", size: "sm") %>
         <% end %>
 
-        <% if !account.linked? && (account.accountable_type == "Depository" || account.accountable_type == "CreditCard") %>
+        <% if !account.linked? && ["Depository", "CreditCard", "Investment"].include?(account.accountable_type) %>
           <%= link_to select_provider_account_path(account),
                       data: { turbo_frame: :modal },
                       class: "group-hover/account:flex hidden hover:opacity-80 items-center justify-center gap-1",