[core] Do not use backticks in the ini files

The "secret_key" is surrounded by the backticks character. This may not be problematic for anyone else, however for anyone dynamically configuring the conf file on deploy (like us--we reconfigure the ini programmatically based on where we are deploying it), the backticks can be problematic. Even just using "cat" on the conf file will cause cat to try and execute "secret_key" as a command, because of the backticks.