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/indent.c b/src/indent.c
index 6ac6182..e1c6f52 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -432,7 +432,8 @@
     {
 	if (*ptr == TAB)
 	{
-	    if (!list || lcs_tab1)    // count a tab for what it is worth
+	    if (!list || curwin->w_lcs_chars.tab1)
+		// count a tab for what it is worth
 		count += ts - (count % ts);
 	    else
 		// In list mode, when tab is not set, count screen char width
@@ -462,7 +463,7 @@
     {
 	if (*ptr == TAB)    // count a tab for what it is worth
 	{
-	    if (!list || lcs_tab1)
+	    if (!list || curwin->w_lcs_chars.tab1)
 		count += tabstop_padding(count, ts, vts);
 	    else
 		// In list mode, when tab is not set, count screen char width