patch 8.2.4481: cmdline popup menu not removed when 'lazyredraw' is set

Problem:    Cmdline popup menu not removed when 'lazyredraw' is set.
Solution:   Temporarily reset 'lazyredraw' when removing the popup menu.
            (closes #9857)
diff --git a/src/cmdexpand.c b/src/cmdexpand.c
index 84dc643..e9db8cf 100644
--- a/src/cmdexpand.c
+++ b/src/cmdexpand.c
@@ -377,9 +377,13 @@
  */
 void cmdline_pum_remove(void)
 {
+    int save_p_lz = p_lz;
+
     pum_undisplay();
     VIM_CLEAR(compl_match_array);
+    p_lz = FALSE;  // avoid the popup menu hanging around
     update_screen(0);
+    p_lz = save_p_lz;
     redrawcmd();
 }