Apply patch #76255 from Roman I Khimov to don't pass crop factor as scale factor to lensfun.

Sixth parameter to Initialize() is actually a scale factor which has nothing
in common with crop factor. I think it's safe to assume that we want no
scaling from lensfun and thus use the value of one.

Ref: http://lensfun.berlios.de/manual/structlfModifier.html
BUGS: 312765
FIXED-IN: 3.0.0
CCBUGS: 312764
CCBUGS: 253941
CCBUGS: 266204
CCBUGS: 267613
CCBUGS: 281783
CCBUGS: 284708
CCMAIL: roman@khimov.ru