I did little researching on this subject:

http://www.mufong.com.tw/Ciba/ciba_g...righteners.pdf

It's amazing how many different products COULD contain optical brighteners, including the very product we use to make photographs ourselves. (see page 9)

I think the first step in this research should be to confirm if the paint OP plans to use indeed contain Optical Brighteners. If the answer is no, then there is no concern. If yes, if it will actually be sufficient to cause problems in photographic processes. My guess is no but without some firm data, we all be guessing.

OP is really asking not about wall color, so I'd suggest he'd start there.

My walls are pretty white. No problems in my personal darkroom. (other than reflection of light leaks from my enlargers)