Describe the bug

Slackware version of mktemp has no support to extra values before the XXXXXX tag.

Fix suggestion

Remove the .tempdir part from mktemp arguments in temp_directory declaration.

To Reproduce

1. Run the script on a Slackware 14.2 box
2. See error

Teminal output

# ./woeusb-5.1.0.bash 
mktemp: cannot make temp dir /tmp/WoeUSB.XXXXXX.tempdir: Invalid argument
The command "temp_directory=$(
    mktemp         -d         -t         WoeUSB.XXXXXX.tempdir
)" failed with exit status "1", program is prematurely aborted

$ mktemp -V
mktemp version debianutils-2.7

Environment

• OS: Slackware 14.2
• Bash: GNU bash, version 4.3.48(1)-release (x86_64-slackware-linux-gnu)
• WoeUSB: 5.1.0