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.

src/term.c

@@ -452,9 +452,11 @@ static tcap_entry_T builtin_xterm[] = {
     {(int)KS_TI,	"\0337\033[?47h"},
     {(int)KS_TE,	"\033[?47l\0338"},
 #  endif
-    {(int)KS_CTI,	"\033[>4;2m"},
-    {(int)KS_CRK,	"\033[?4m"},  // see "builtin_mok2"
-    {(int)KS_CTE,	"\033[>4;m"},
+    // These are now under control of the 'keyprotocol' option, see
+    // "builtin_mok2".
+    // {(int)KS_CTI,	"\033[>4;2m"},
+    // {(int)KS_CRK,	"\033[?4m"},
+    // {(int)KS_CTE,	"\033[>4;m"},
     {(int)KS_CIS,	"\033]1;"},
     {(int)KS_CIE,	"\007"},
     {(int)KS_TS,	"\033]2;"},

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    996,
 /**/
     995,
 /**/