Remove blackslash at start

[geraldholdsworth]

Asked by lurkio on Stardot:

Also, I wonder if it would be better to omit the backslash at the start of the filename of the exported file?

[geraldholdsworth]

Disc Image Reader was originally written for Windows. Windows uses a '' to separate directories while macOS uses '/'. Lazarus provides a constant so the code doesn't need to change depending on which platform the application is compiled on.