Fix crash on /submit when LiveStash restores CSV tab without csv_result assign

Set all assigns before LiveStash recovery so reconnecting to the CSV
tab doesn't crash on missing :csv_result / :csv_preview keys.

lib/microwaveprop_web/live/submit_live.ex

@@ -17,25 +17,27 @@ defmodule MicrowavepropWeb.SubmitLive do
   def mount(_params, _session, socket) do
     socket = allow_upload(socket, :csv, accept: ~w(.csv), max_entries: 1, max_file_size: 10_000_000)
 
+    changeset = Radio.change_contact(%Contact{})
+
+    socket =
+      assign(socket,
+        page_title: "Submit Contact",
+        form: to_form(changeset),
+        band_options: @band_options,
+        mode_options: @mode_options,
+        submitted_at: nil,
+        active_tab: :single,
+        csv_preview: nil,
+        csv_result: nil,
+        csv_email: ""
+      )
+
     case LiveStash.recover_state(socket) do
       {:recovered, socket} ->
         {:ok, socket}
 
       _ ->
-        changeset = Radio.change_contact(%Contact{})
+        {:ok, socket}
-
-        {:ok,
-         assign(socket,
-           page_title: "Submit Contact",
-           form: to_form(changeset),
-           band_options: @band_options,
-           mode_options: @mode_options,
-           submitted_at: nil,
-           active_tab: :single,
-           csv_preview: nil,
-           csv_result: nil,
-           csv_email: ""
-         )}
     end
   end