patch 8.2.0351: terminal in popup test is still a bit flaky

Problem:    Terminal in popup test is still a bit flaky.
Solution:   Clear and redraw before opening the popup.
diff --git a/src/version.c b/src/version.c
index c0e1b91..b9fc30a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    351,
+/**/
     350,
 /**/
     349,