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

@@ -17,14 +17,9 @@ 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)
 
-    case LiveStash.recover_state(socket) do
-      {:recovered, socket} ->
-        {:ok, socket}
-
-      _ ->
     changeset = Radio.change_contact(%Contact{})
 
-        {:ok,
+    socket =
       assign(socket,
         page_title: "Submit Contact",
         form: to_form(changeset),
@@ -35,7 +30,14 @@ defmodule MicrowavepropWeb.SubmitLive do
         csv_preview: nil,
         csv_result: nil,
         csv_email: ""
-         )}
+      )
+
+    case LiveStash.recover_state(socket) do
+      {:recovered, socket} ->
+        {:ok, socket}
+
+      _ ->
+        {:ok, socket}
     end
   end