JSpecify @Nullable and @NonNull are not inlined for fields with default visibility

[jonatan-ivanov]

If a field has default visibility (no public/protected/private modifier), the formatter puts JSpecify @Nullable and @NonNull annotations into a separate line.

@Nullable Object one;

@NonNull Object two;

will be

@Nullable
Object one;

@NonNull
Object two;

See: #442