patch 9.0.0343: ColorScheme autocommand triggered when colorscheme not found

Problem:    ColorScheme autocommand triggered when colorscheme is not found.
            (Romain Lafourcade)
Solution:   Only trigger ColorScheme when loading the colorscheme succeeds.
            (closes #11024)
diff --git a/src/version.c b/src/version.c
index 68f7baa..f2991b8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -708,6 +708,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    343,
+/**/
     342,
 /**/
     341,