#1 Freon installer assumes /dev/hda for bootloader installation

When installing Freon, I found out that GRUB was attempting to install the bootloader on /dev/hda, instead of my target device /dev/sda. The GRUB installer should use $DEVICE instead of a hardcoded device. Issue is at this line: https://notabug.org/Pentium44/FreonLinux/src/master/files/bin/freezedry#L79