runtime: clipboard: start daemons in /

This avoids the issue of nvim started daemons causing mountpoints to be
unmountable. This is currently the only place in runtime/ where this
calling convention occurred.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

runtime/autoload/provider/clipboard.vim

@@ -94,6 +94,7 @@ function! s:clipboard.set(lines, regtype, reg)
   let selection.data = [a:lines, a:regtype]
   let argv = split(s:copy[a:reg], " ")
   let selection.detach = s:cache_enabled
+  let selection.cwd = "/"
   let jobid = jobstart(argv, selection)
   if jobid <= 0
     echohl WarningMsg