Use SKIN instead of forcing colors

[someoneyouspite]

wuma/lua/wuma/client/vgui/vgui_settings.lua

Line 13 in 957a71f

draw.DrawText("Server settings", "DermaDefaultBold", 0, h/2-7, Color(0, 0, 0), TEXT_ALIGN_LEFT)

I have a custom dark derma skin and WUMA is the only thing I have that doesn't respect SKIN variables.
Please replace all dark text colors with SKIN.text_dark.