Fix astrobin script path

systemd/.config/systemd/user/changepaper.sh

@@ -55,7 +55,7 @@ fi
 
 BASEDIR="$HOME/var/inbox/astrobin/"
 # use python script to get astrobin iotd
-./get_astrobin_potd.py
+python ~/.config/systemd/user/get_astrobin_potd.py
 
 date=$(date '+%Y-%m-%d')