Field[I] := V inside a method, where Field is a class field of the current
class carrying a writable default array property, reported "Undeclared variable
'Field'": AnalyseStaticSubscriptAssign's implicit-Self branch only handled
array-typed fields, so a class field with a default property fell through.
Extend that branch: when the Self field is a class with a writable default
property, set IsImplicitSelf + ImplicitFieldInfo + PropWriteInfo and lower to
the default property's setter (mirroring the variable-receiver path). Both
codegen backends gain an implicit-Self receiver in the static-subscript
property-write path: load Self, reach the field slot, dereference to the
field's object, then call the setter.
(The implicit-Self read Field[I] already worked.) e2e test writes and reads a
default property through a Self field from inside methods, verified on QBE and
native.
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