patch 8.0.1288: GUI: cannot drag the statusline of a terminal window

Problem:    GUI: cannot drag the statusline of a terminal window.
Solution:   Handle the TERMINAL state. (Hirohito Higashi)
diff --git a/src/version.c b/src/version.c
index 89f4046..ee19745 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1288,
+/**/
     1287,
 /**/
     1286,