Remove dead code found by the type system

Author: josevalim

lib/livebook_web/live/file_select_component.ex

@@ -221,9 +221,7 @@ defmodule LivebookWeb.FileSelectComponent do
       <div
         :if={not @loading}
         class={[
-          "grow -m-1 p-1 h-full rounded-lg relative",
-          @loading && "overflow-y-hidden",
-          not @loading && "overflow-y-auto tiny-scrollbar"
+          "grow -m-1 p-1 h-full rounded-lg relative overflow-y-auto tiny-scrollbar"
         ]}
         tabindex="-1"
         phx-hook="Dropzone"

lib/livebook_web/live/session_live/section_component.ex

@@ -225,7 +225,7 @@ defmodule LivebookWeb.SessionLive.SectionComponent do
           <.remix_icon
             :if={@section_view.parent}
             icon="arrow-right-s-line"
-            class={[(@section_view.parent && @section_view.parent.id == parent.id) || "invisible"]}
+            class={[@section_view.parent.id == parent.id || "invisible"]}
           />
           <span>{parent.name}</span>
         </button>