Add the Sync non-standard capability for synchronized updates to terminfo

Since the geniuses at terminal-wg are trying their best to create chaos
by retroactively changing the escape code used for this feature, it is
good to have a property for it in terminfo. Since tmux already uses Sync
for it, follow that in kitty's terminfo.

terminfo/kitty.terminfo

@@ -17,6 +17,7 @@ xterm-kitty|KovIdTTY,
 	lines#24,
 	pairs#32767,
 	Smulx=\E[4:%p1%dm,
+	Sync=\EP=%p1%ds\E\,
 	acsc=++\,\,--..00``aaffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~,
 	bel=^G,
 	bold=\E[1m,