Bugfix [#35075] Physics Panel of Particles Fluid is Truncated

Some RNA Properties were not updated in UI scripts after a recent refactoring
there removing "use_" prefix from some of the boolean properties (strangely
though, while every other property attached to SPHFluidSettings.flag has gone
from "use_factor_blah" to "factor_blah", use_factor_density still keeps the old
prefix).


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56288 954f8c5b-7b00-dc11-b283-0030488c597c