fix(submit): clear command line after password prompt

Problem: the first status notification after `inputsecret` rendered on
the same line as the password prompt.

Solution: call `vim.cmd.redraw()` after `inputrestore` to flush the
command line before the callback fires notifications.

lua/cp/submit.lua

@@ -25,6 +25,7 @@ local function prompt_credentials(platform, callback)
     vim.fn.inputsave()
     local password = vim.fn.inputsecret(platform .. ' password: ')
     vim.fn.inputrestore()
+    vim.cmd.redraw()
     if not password or password == '' then
       logger.log('Submit cancelled', vim.log.levels.WARN)
       return