dirs in context color fix

[a-gruzdev]

When you launch nnn -D , directories use some default color instead of context color

I made some investigation and found out that this check if (color_pair && fcolors[color_pair]) is always false for context colors, as it's values in fcolors are always 0.

I added it's initialization in initcurses to fix this. Now it looks like this

[jarun]

Did you test without -D to confirm there are no side effects?

[N-R-K]

Looks okay to me. Did some light testing and everything seems to work as expected.

[a-gruzdev]

yes, tested without -D, dirs use their color from fcolors (blue by default), and everything else works as expected

[jarun]

Thank you!