patch 8.0.1642: running Vim in terminal fails with two windows

Problem:    Running Vim in terminal fails with two windows.
Solution:   Pass the number of rows to RunVimInTerminal().
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index a7e5f61..6f65518 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -1064,7 +1064,7 @@
 	\ 'redraw',
 	\ "set t_ts=",
 	\ ], 'Xscript')
-  let buf = RunVimInTerminal('-S Xscript', {})
+  let buf = RunVimInTerminal('-S Xscript', {'rows': 10})
   call WaitFor({-> expand('%:t') =='Xtextfile'})
   call assert_equal(textfile_winid, win_getid())