This PR fixes a number of items in Preferences that "Reset to Default"
to different values than the default preferences. For some items this
is because they just have incorrect values, some have redundancies
between the U_default struct and property default, and many others are
caused by our code that reverses struct defaults for properties that
are "negative SDNA", or don't struct defaults for enum_bitflag_sdna
properly. Items include "show_splash", "anisotropic_filter", etc.
Pull Request: https://projects.blender.org/blender/blender/pulls/132762
6a06e87f85