Crash on Windows when using `:restart`

Describe the bug Neovide crashes when restarting the instance with :restart

To Reproduce Steps to reproduce the behavior:

1. Open Neovide
2. Run :restart in Neovim

Expected behavior Not crashing

Screenshots N/A

Desktop (please complete the following information):

• OS: Microsoft Windows 11 25H2 (Build 26200.9168)
• Neovide (master ba8c41f423c9a8f0cb14ff19baa6f538c95e52bf), also happens on v0.16.2
• Neovim Version NVIM v0.13.0-dev-1824+gc5ea9ca2ad

The error happens in this block: https://github.com/neovide/neovide/blob/ba8c41f423c9a8f0cb14ff19baa6f538c95e52bf/src/bridge/session.rs#L197

Running through the debugger I see that the incoming address is: //./pipe/...., so when format! runs, it ends up as \\.\pipe\//./pipe/..., thus crashing. Changing the address check and formatting to that form fixes the issue. I'm just not sure if this is a Windows or a Neovim thing, nor what compatibility issues this fix may cause.