fix(utils): Vim:E475 after adding opts to jobstart wrapper

Looks like I've broken open and save after adding opts. This should
adress this. For some reason vim.fn.jobstart() can't handle an empty
table as opts. Maybe someone has a better solution that this, but this
works for now.

Author: MarcoBuess

lua/markmap/utils.lua

@@ -17,9 +17,9 @@ local is_windows = uv.os_uname().sysname == "Windows_NT"
 ---@return number job pid of the job, so we can stop it later.
 M.jobstart = function(cmd, arguments, opts)
   if is_windows then
-    return vim.fn.jobstart({ cmd, unpack(arguments) }, opts)
+    return opts and vim.fn.jobstart({ cmd, unpack(arguments) }, opts) or vim.fn.jobstart({ cmd, unpack(arguments) })
   else
-    return vim.fn.jobstart(cmd .. " " .. table.concat(arguments, " "), opts)
+    return opts and vim.fn.jobstart(cmd .. " " .. table.concat(arguments, " "), opts) or vim.fn.jobstart(cmd .. " " .. table.concat(arguments, " "))
   end
 end