netstat: Remove padding from cc and stack fields

Trim white space padding that gets added libxo fields cc and stack when
using -C and -c.

The padding is only visible if you're using multiple stacks or
congestion algorithms.

PR:             292262
MFC after:      5 days
Reviewed by:    asomers, tuexen
Approved by:    asomers (mentor)
Differential Revision:  https://reviews.freebsd.org/D54709

usr.bin/netstat/inet.c

@@ -541,11 +541,11 @@ protopr(u_long off, const char *name, int af1, int proto)
 		}
 		if (istcp) {
 			if (cflag)
-				xo_emit(" {:stack/%-*.*s}",
+				xo_emit(" {t:stack/%-*.*s}",
 					
 					fnamelen, fnamelen, tp->xt_stack);
 			if (Cflag)
-				xo_emit(" {:cc/%-*.*s}"
+				xo_emit(" {t:cc/%-*.*s}"
 					" {:snd-cwnd/%10lu}"
 					" {:snd-ssthresh/%10lu}"
 					" {:t-maxseg/%5u} {:ecn/%3s}",