Fix typo

Author: wdormann

install_tapioca.sh

@@ -379,7 +379,7 @@ if sudo [ -f /var/lib/AccountsService/users/tapioca ]; then
  sudo sed -i.bak -e 's/XSession=.*/XSession=xfce/' /var/lib/AccountsService/users/tapioca
  sessionset=1
  fi
- if [ -z "$sessionset"]; then
+ if [ -z "$sessionset" ]; then
  # Append a new XSession line
  sudo bash -c "echo XSession=xfce >> /var/lib/AccountsService/users/tapioca"
  fi