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/misc1.c b/src/misc1.c
index 010622e..a72dc9b 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -403,7 +403,7 @@
      * If list mode is on, then the '$' at the end of the line may take up one
      * extra column.
      */
-    if (wp->w_p_list && lcs_eol != NUL)
+    if (wp->w_p_list && wp->w_lcs_chars.eol != NUL)
 	col += 1;
 
     /*
@@ -460,7 +460,8 @@
      * from one screen line to the next (when 'columns' is not a multiple of
      * 'ts') -- webb.
      */
-    if (*s == TAB && (State & NORMAL) && (!wp->w_p_list || lcs_tab1))
+    if (*s == TAB && (State & NORMAL) && (!wp->w_p_list ||
+							wp->w_lcs_chars.tab1))
 	col += win_lbr_chartabsize(wp, line, s, (colnr_T)col, NULL) - 1;
 
     /*