Description of problem:
A missing '{' in /etc/profile.d/atuin.sh will cause the zsh-specific section
to run for any non-bash shell.

Version-Release number of selected component:
atuin-all-users-18.6.1-2.fc43.noarch.rpm
Bug also exists in other releases.

How reproducible:
100% for non-bash users.
Not hit for bash users.

The bug can be seen by inspection of line 12 of /etc/profile.d/atuin.sh :

      ...
   3  # Check for bash environment
   4  if [ -n "${BASH_VERSION-}" ]; then
      ...
  11  # Check for zsh environment
  12  elif [ -n "$ZSH_VERSION-}" ]; then    ### should be "${ZSH_VERSION-}"
      ...

Actual results:
That expansion on line 12 will always result in "-}", and the test will
always evaluate to true.

Expected results:
For non-zsh, the expansion should be blank, the test should be false.
For zsh, the expansion should be "5.9", the test should be true.

Additional info:
Note that the 'elif' is reached only in a non-bash shell.