patch 8.0.0833: terminal test fails

Problem:    Terminal test fails.
Solution:   Update the row argument to one based.
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index acf69be..8df690c 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -25,7 +25,7 @@
 endfunc
 
 func Check_123(buf)
-  let l = term_scrape(a:buf, 0)
+  let l = term_scrape(a:buf, 1)
   call assert_true(len(l) > 0)
   call assert_equal('1', l[0].chars)
   call assert_equal('2', l[1].chars)
@@ -37,7 +37,7 @@
     call assert_equal('#000000', l[0].bg)
   endif
 
-  let l = term_getline(a:buf, 0)
+  let l = term_getline(a:buf, 1)
   call assert_equal('123', l)
 endfunc