copr: fix deprecation warning about evaluating devel as a bare variable
    
        [DEPRECATION WARNING]: evaluating devel as a bare variable, this
        behaviour will go away and you might need to add |bool to the expression
        in the future. Also see CONDITIONAL_BARE_VARS configuration toggle..
        This feature will be removed in
         version 2.12. Deprecation warnings can be disabled by setting
         deprecation_warnings=False in ansible.cfg.