patch 8.1.0338: MS-Windows: VTP doesn't work properly with Powershell

Problem:    MS-Windows: VTP doesn't work properly with Powershell.
Solution:   Adjust the color index. (Nobuhiro Takasaki, closes #3347)
diff --git a/src/version.c b/src/version.c
index 12c86aa..7dd1591 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    338,
+/**/
     337,
 /**/
     336,