1PUX & icon fileIds

Vault avatars in the 1PUX include the file suffix, as do the exported files in the files directory.

Icon's only include the fileId, and not the file's suffix.

```
$ ls
5uepa4ohiflwicgxfzpqiy7daq v3uwoz4nengqbnjtjvlewuozx4.png
dheameb2qterfrk3h7izqyshqq_afile.txt x2nmseo37oqvci7sju7w2tbgdq_afile.txt

$ file 5uepa4ohiflwicgxfzpqiy7daq v3uwoz4nengqbnjtjvlewuozx4.png
5uepa4ohiflwicgxfzpqiy7daq: PNG image data, 180 x 180, 8-bit/color RGBA, non-interlaced
v3uwoz4nengqbnjtjvlewuozx4.png: PNG image data, 128 x 128, 8-bit/color RGB, non-interlaced

        "avatar": "v3uwoz4nengqbnjtjvlewuozx4.png",

          "overview": {
            "subtitle": "",
            "icons": {
              "detail": {
                "fileId": "5uepa4ohiflwicgxfzpqiy7daq"
              }
            },

```

Is this intentional?

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