patch 8.0.0293: some tests have a one or three second wait

Problem:    Some tests have a one or three second wait.
Solution:   Reset the 'showmode' option.  Use a test time of one to disable
            sleep after an error or warning message.
diff --git a/src/version.c b/src/version.c
index 1d83da4..0a5e3d3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    293,
+/**/
     292,
 /**/
     291,