patch 9.0.0930: cannot debug the Kitty keyboard protocol with TermDebug

Problem:    Cannot debug the Kitty keyboard protocol with TermDebug.
Solution:   Add Kitty keyboard protocol support to the libvterm fork.
            Recognize the escape sequences that the protocol generates.  Add
            the 'keyprotocol' option to allow the user to specify for which
            terminal what protocol is to be used, instead of hard-coding this.
            Add recognizing the kitty keyboard protocol status.
diff --git a/src/os_unix.c b/src/os_unix.c
index db57902..0540fc9 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -5348,9 +5348,9 @@
 		long delay_msec = 1;
 
 		if (tmode == TMODE_RAW)
-		    // possibly disables modifyOtherKeys, so that the system
-		    // can recognize CTRL-C
-		    out_str(T_CTE);
+		    // Possibly disables modifyOtherKeys, so that the system
+		    // can recognize CTRL-C.
+		    out_str_t_TE();
 
 		/*
 		 * Similar to the loop above, but only handle X events, no