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/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,