Update calibre-web.sh

Don't wipe out people's databases. Removed the lines that did.

ct/calibre-web.sh

@@ -65,8 +65,6 @@ function update_script() {
   rm kepubify-linux-64bit
   curl -fsSLO https://github.com/pgaskin/kepubify/releases/latest/download/kepubify-linux-64bit &>/dev/null
   chmod +x kepubify-linux-64bit
-  rm /opt/calibre-web/metadata.db
-  wget https://github.com/janeczku/calibre-web/raw/master/library/metadata.db -P /opt/calibre-web
   menu_array=("1" "Enables gdrive as storage backend for your ebooks" OFF \
     "2" "Enables sending emails via a googlemail account without enabling insecure apps" OFF \
     "3" "Enables displaying of additional author infos on the authors page" OFF \