Fixed crashing bug, final check before submit

[Schleimer, Ben]

Hi all,
   I fixed the crashing bug with the 32bit float. (it was because there's no default profile for
32bit float)

Unfortunately, I encountered a worst bug. In kis_paint_device.cc (line 720) , the id's of the
colorspaces are compared but the profiles are not. So I changed the comparsion to compare the
pointers like its done in KisImage::convertTo and that seemed to do the trick.

If noone objects, I'll submit it.

Cheers
Ben
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