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/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index 1a9e1e3..8cbd6a6 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -2357,6 +2357,7 @@
   call writefile(lines, 'XtermPopup')
   let buf = RunVimInTerminal('-S XtermPopup', #{rows: 15})
   call term_wait(buf, 100)
+  call term_sendkeys(buf, "\<C-L>")
   call term_sendkeys(buf, ":call OpenTerm(0)\<CR>")
   call term_wait(buf, 100)
   call term_sendkeys(buf, ":\<CR>")
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,