patch 8.2.0461: confirm test fails on amd64 system

Problem:    Confirm test fails on amd64 system. (Alimar Riesebieter)
Solution:   Add an extra WaitForAssert(). (Dominique Pelle)
diff --git a/src/testdir/test_excmd.vim b/src/testdir/test_excmd.vim
index ec252a6..d5588d6 100644
--- a/src/testdir/test_excmd.vim
+++ b/src/testdir/test_excmd.vim
@@ -264,6 +264,8 @@
   call WaitForAssert({-> assert_match('^\[Y\]es, (N)o, (C)ancel: *$',
         \ term_getline(buf, 20))}, 1000)
   call term_sendkeys(buf, "N")
+  call WaitForAssert({-> assert_match('^ *0,0-1         All$',
+        \ term_getline(buf, 20))}, 1000)
   call StopVimInTerminal(buf)
 endfunc