Change install command to include -t option

[mdierolf]

The install command should treat the destination as a directory, not a file or directory. Added the -t option to the install command to implement this behavior

This should fix this error:

# rm /usr/local/bin 

# ls -la /usr/local/bin
ls: cannot access '/usr/local/bin': No such file or directory

# curl -fLSs https://raw.githubusercontent.com/CircleCI-Public/circleci-cli/main/install.sh | bash
Starting installation.
Installing CircleCI CLI v0.1.33494
Installing to /usr/local/bin
An error occured installing the tool.
The contents of the directory /tmp/tmp.fBvjlvSUXG have been left in place to help to debug the issue.

# ls -la /usr/local/bin 
-rwxr-xr-x 1 root root 30974136 Nov 13 10:20 /usr/local/bin