patch 8.2.4382: a custom 'tabline' may cause Esc to work like Enter

Problem:    A custom 'tabline' may cause Esc to work like Enter on the
            command line when the popup menu is displayed.
Solution:   Save and restore KeyTyped. (closes #9776)
diff --git a/src/screen.c b/src/screen.c
index adcc4b5..9010090 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -1235,6 +1235,7 @@
     int		use_sandbox = FALSE;
     win_T	*ewp;
     int		p_crb_save;
+    int		save_KeyTyped = KeyTyped;
 
     // There is a tiny chance that this gets called recursively: When
     // redrawing a status line triggers redrawing the ruler or tabline.
@@ -1394,6 +1395,9 @@
 
 theend:
     entered = FALSE;
+
+    // A user function may reset KeyTyped, restore it.
+    KeyTyped = save_KeyTyped;
 }
 
 #endif // FEAT_STL_OPT