fix: use path instead of filepath for asset embeds to support Windows

[aschmahmann]

fixes #8943.

Note: CI won't help us here because we don't really have any Windows testing 😢.

[ajnavarro]

LGTM, tested on a windows virtual machine:

PS C:\Users\User> .\ipfs.exe init
generating ED25519 keypair...done
peer identity: 12D3KooWQEsJXdLxdst5a2CtaaMChvHAkTUAkjDFqmyuTdpqhkvL
initializing IPFS node at C:\Users\User\.ipfs
to get started, enter:

        ipfs cat /ipfs/QmQPeNsJPyVWPFDVHb77w8G42Fvo15z4bG2X8D2GhfbSXc/readme

PS C:\Users\User> ./ipfs.exe cat /ipfs/QmQPeNsJPyVWPFDVHb77w8G42Fvo15z4bG2X8D2GhfbSXc/readme
Hello and Welcome to IPFS!

██╗██████╗ ███████╗███████╗
██║██╔══██╗██╔════╝██╔════╝
██║██████╔╝█████╗  ███████╗
██║██╔═══╝ ██╔══╝  ╚════██║
██║██║     ██║     ███████║
╚═╝╚═╝     ╚═╝     ╚══════╝

If you're seeing this, you have successfully installed
IPFS and are now interfacing with the ipfs merkledag!

 -------------------------------------------------------
| Warning:                                              |
|   This is alpha software. Use at your own discretion! |
|   Much is missing or lacking polish. There are bugs.  |
|   Not yet secure. Read the security notes for more.   |
 -------------------------------------------------------

Check out some of the other files in this directory:

  ./about
  ./help
  ./quick-start     <-- usage examples
  ./readme          <-- this file
  ./security-notes
PS C:\Users\User>