patch 8.0.0304: assign test fails in the GUI

Problem:    Assign test fails in the GUI.
Solution:   Skip the test for setting t_k1.
diff --git a/src/version.c b/src/version.c
index 037c2dd..9273b2b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    304,
+/**/
     303,
 /**/
     302,