Blender Git Loki

Cleanup: remove redundant decorator for eevee 'overscan_size'

All eevee scene properties are not animatable due to
`RNA_define_animate_sdna(false)` so there is no need for an animation
decorator here (would not show anyways).

Not sure if setting use_property_decorate to False and then manually
adding one again was a hack in rB7fc60bff14a6 to get the alignment
right, but seems to work good now without it.

Note: there also seems to be an inconsistency here generally:
- Eevee reserves room for an animation decorator in almost every panel
(except for "Sampling" and "Indirect Lighting") even though almost none
are animatable (except for stuff in "Hair" and "Film"). This looks nice
if multiple panels are expanded (except for mentioned "Sampling" and
"Indirect Lighting" -- maybe these should also reserve the room?)
- Cycles does not use animation decorators at all (even though pretty
much everything is animatable here -- maybe these should also use
animation decorators?)
- Then there is also the 'shared' "Grease Pencil", "Freestyle" and
"Colormanagement" -- these dont use animation decorators, but some stuff
is animatable...

Regarding the note: not sure what the guidelines here are, if this is
isolated to each panel then there is lots of stuff for eevee that could
set use_property_decorate to False, if multiple open panels are
considered (for nice visual consistency between them), then there is
romm for improvement elsewhere, too.

Maniphest Tasks: T81411

Differential Revision: https://developer.blender.org/D9164