Remove typo s

apps/fz_http/lib/fz_http/devices.ex

@@ -187,12 +187,12 @@ defmodule FzHttp.Devices do
 
   defp persistent_keepalives_config(device) do
     pk = persistent_keepalives(device)
-    pk && "PersistentKeepalives = #{pk}"
+    pk && "PersistentKeepalive = #{pk}"
 
     if is_nil(pk) do
       ""
     else
-      "PersistentKeepalives = #{pk}"
+      "PersistentKeepalive = #{pk}"
     end
   end
 

apps/fz_http/test/fz_http_web/live/device_live/show_test.exs

@@ -197,7 +197,7 @@ defmodule FzHttpWeb.DeviceLive.ShowTest do
       assert flash["info"] == "Device updated successfully."
 
       {:ok, _view, html} = live(conn, path)
-      assert html =~ "PersistentKeepalives = 120"
+      assert html =~ "PersistentKeepalive = 120"
     end
 
     test "prevents empty names", %{authed_conn: conn, device: device} do