Improve mobileprovision preview visiblity in dark mode

[myonlylonely]

The visibility of the mobileprovision file preview in dark mode is quite poor. Please consider changing the text to a different color.

[Evgeny Aleksandrov]

Hey!
ProvisionQL has Dark Mode support since 1.6.0 (#29).
That's Xcode's own plugin on your screenshot. It overrides ProvisionQL, look here for a fix:

• #20.

[myonlylonely]

Nice!