If test#neovim#term_position is set to something like botright 10 to setup a terminal that is 10 in height and we need to reopen the terminal since it isn't visible, the current s:neovim_reopen_term() function doesn't correctly re-open the terminal with the appropriate height. This PR addresses this by running something like botright 10 new | buffer [bufnr] which sets the height correctly instead of botright 10 sbuffer [bufnr] which doesn't.

Make sure these boxes are checked before submitting your pull request:

• Add fixtures and spec when implementing or updating a test runner
• Update the README accordingly
• Update the Vim documentation in doc/test.txt