Updates icons to match original Lyra

Adds a unique icon for firmware bins in the file browser

src/activities/home/HomeActivity.cpp

@@ -255,7 +255,7 @@ void HomeActivity::render(RenderLock&&) {
   // Build menu items dynamically
   std::vector<const char*> menuItems = {tr(STR_BROWSE_FILES), tr(STR_MENU_RECENT_BOOKS), tr(STR_FILE_TRANSFER),
                                         tr(STR_SETTINGS_TITLE)};
-  std::vector<UIIcon> menuIcons = {Folder, Recent, Transfer, Settings};
+  std::vector<UIIcon> menuIcons = {Folder, Book, Transfer, Settings};
 
   if (hasOpdsServers) {
     menuItems.insert(menuItems.begin() + 2, tr(STR_OPDS_BROWSER));