[Frug]: `section_order` does not work when used on files inside of `group`s

[AngheloAlf]

Explain the problem.

Using section_order: { .blah .urgh } on a file entry that's inside a group kind doesn't override the global section order, instead it emits the entries in the original order.

Reproducer

segments:
  - name: example
    files:
      - { path: blehh.o }
      - kind: group
        files:
          - { path: src/rsp/rspboot.o }
          - { path: src/rsp/aspMain.o, section_order: { .data: .rodata } }
          - { path: src/rsp/f3dex2.o, section_order: { .data: .rodata } }
          - { path: src/rsp/s2dex.o, section_order: { .data: .rodata } }

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0.1.0 commit 45b723b8242c74ae32516528e121585ec3580bde

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