New --config-file option needs prepended slash

[kedodrill]

Describe the bug
I attempted to use the new --config-file option with a different config file and got the error "file missing or corrupted". I noticed in settings.h that the default has a slash prepended to it. Once I added that, it worked.

I am on Linux so this may be different from the behavior on Windows / Mac. The documentation just says to use a string with no slash, which I am assuming works elsewhere. However, the option did not work for me on Linux without the slash.

To Reproduce
Run an app with the --config-file option on Linux with no prepended slash

Expected behavior
For the app to run as it would typically, but with a different config file

Specifications

• OS: Void Linux, glibc, x86_64
• Neutralinojs version: 4.15.0
• Neutralinojs client library version: 3.12.0
• Neutralinojs CLI version: 10.1.0

[yashkhandelwal123]

Hi, I would like to work on it.