patch 8.1.0026: terminal test fails with very tall terminal

Problem:    Terminal test fails with very tall terminal. (Tom)
Solution:   Fix the terminal window size in the test.
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index c4e49b7..4cd7757 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -270,7 +270,7 @@
 endfunc
 
 func Test_terminal_scrollback()
-  let buf = Run_shell_in_terminal({})
+  let buf = Run_shell_in_terminal({'term_rows': 15})
   set termwinscroll=100
   call writefile(range(150), 'Xtext')
   if has('win32')
diff --git a/src/version.c b/src/version.c
index dce336e..72960f3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    26,
+/**/
     25,
 /**/
     24,