fixed preview.sh when first char in ytid is - such as -yK

.gitignore

@@ -1,3 +1,6 @@
+download.txt
+download_err.txt
+thumberr.txt
 *youtube_stuffs.db
 thumbnails/**
 vids/**

preview.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
 cd "$(dirname "$0")"
 rowid="$(echo $1 | sed 's/|.*//g')"
-thumbnail="$(ls thumbnails/ | grep "$(sqlite3 ./youtube_stuffs.db "select id from ytlist where rowid=$rowid;").*" )"
+thumbnail="$(ls thumbnails/ | grep -e "$(sqlite3 ./youtube_stuffs.db "select id from ytlist where rowid=$rowid;").*" )"
 printf "thumbnails/$thumbnail"