patch 8.2.2518: 'listchars' should be window-local

Problem:    'listchars' should be window-local.
Solution:   Make 'listchars' global-local. (Yegappan Lakshmanan, Marco Hinz,
            closes #5206, closes #7850)
diff --git a/src/option.h b/src/option.h
index 4bc189c..349268c 100644
--- a/src/option.h
+++ b/src/option.h
@@ -1231,6 +1231,7 @@
 enum
 {
     WV_LIST = 0
+    , WV_LCS
 #ifdef FEAT_ARABIC
     , WV_ARAB
 #endif