[RPM] Use correct default rpmlint path

[mcoufal]

As a default, rpmlint path in Preferences > RPM > Rpmlint is set to path that would point to rpmlint outside of the sandbox (/usr/bin/rpmlint in my case). That leads to an error: "Value must be an existing file". This binary seems to be actually mirrored (somewhere under /run/usr) and is automatically used when selecting /usr/bin/rpmlint using the Browse... button and system's file explorer.

Can we make the mirrored path default, so rpmlint works out of the box?