fix: C-Space was not mappable on Windows

[Geobert]

Fixes https://github.com/neovide/neovide/issues/2669

What kind of change does this PR introduce?

• Fix

Did this PR introduce a breaking change?

• No

I had this keymap that wasn’t working before the change and works with it

vim.keymap.set('n', '<C-Space>', '<cmd>echomsg "Test!"<CR>')