[Qt-creator] inkpot theme corrections.

[Campbell Barton]

Heres some corrections to inkpot color scheme

www.graphicall.org/ftp/ideasman42/inkpot.diff

- numbers were blue, should be yellow
- preprocessor used wrong shade of green
- bracket matching was missing background color.
- operators were green, when this isn't so for the vim original.

reference
https://github.com/ciaranm/inkpot/

realize this should be done with gerrit but its a bit of a hassle to
setup, would someone mind applying these changes?

-- 
- Campbell