patch 8.1.2039: character from 'showbreak' does not use 'wincolor'

Problem:    Character from 'showbreak' does not use 'wincolor'. (Nick Jensen)
Solution:   Mix with 'wincolor'. (closes #4938)
diff --git a/src/version.c b/src/version.c
index 98e69d4..a2f6417 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2039,
+/**/
     2038,
 /**/
     2037,