patch 9.0.0996: if 'keyprotocol' is empty "xterm" still uses modifyOtherKeys

Problem:    If 'keyprotocol' is empty "xterm" still uses modifyOtherKeys.
Solution:   Remove t_TI, t_RK and t_TE from the "xterm" builtin termcap and
            let the default value of 'keyprotocol' add those.
diff --git a/src/version.c b/src/version.c
index 444e9bf..8ccf7d2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    996,
+/**/
     995,
 /**/
     994,