Move slideshow temp file to external storage

lib/update_util/lfs_backup.c

@@ -2,7 +2,6 @@
 
 #include <toolbox/tar/tar_archive.h>
 
-#include <desktop/helpers/slideshow_filename.h>
 #include <notification/notification_settings_filename.h>
 
 #define LFS_BACKUP_DEFAULT_LOCATION EXT_PATH(LFS_BACKUP_DEFAULT_FILENAME)
@@ -15,7 +14,6 @@ static void backup_name_converter(FuriString* filename) {
     /* Filenames are already prefixed with '.' */
     const char* const names[] = {
         NOTIFICATION_SETTINGS_FILE_NAME,
-        SLIDESHOW_FILE_NAME,
     };
 
     for(size_t i = 0; i < COUNT_OF(names); i++) {