Fix for crop tool crash

[Cyrille Berger]

Hi,

We discussed this on IRC. Here is the conclusion:
* paintdevice colorspaces belongs to the paintdevice, therefor they have a 
short/unpredictable life expectency, you should only use them as long as you 
are certain that the paintdevice won't be deleted
* if you need to keep a pointer of the color space (like in a KoColor), you 
need to ask the KoColorSpaceRegistry for a permanent colorspace (see the 
permanentColorspace function)

In this case, since it's a property of the layer. Storing the id/name in the 
model would be the way to go.

-- 
Cyrille Berger
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