fix ammo group create not handling invalid attrs

lib/cannery/ammo.ex

@@ -256,6 +256,12 @@ defmodule Cannery.Ammo do
     |> Repo.insert()
   end
 
+  def create_ammo_group(invalid_attrs, _user) do
+    %AmmoGroup{}
+    |> AmmoGroup.create_changeset(invalid_attrs |> Map.put("user_id", "-1"))
+    |> Repo.insert()
+  end
+
   @doc """
   Updates a ammo_group.
 

lib/cannery_web/live/ammo_type_live/form_component.html.heex

@@ -98,8 +98,7 @@
       class: "mr-4 title text-lg text-primary-600"
     ) %>
     <%= text_input(f, :powder_type,
-      class: "text-center col-span-2 input input-primary",
-      placeholder: gettext("Brass")
+      class: "text-center col-span-2 input input-primary"
     ) %>
     <%= error_tag(f, :powder_type, "col-span-3 text-center") %>