BUG/MINOR: stats: Remove a break preventing ST_F_QCUR to be set for servers

There is an extra break statement wrongly placed in stats_fill_sv_stats()
function, just before filling the ST_F_QCUR field. It prevents this field to
be set to the right value for servers.

No backport needed except if commit 3a9a4992 ("MEDIUM: stats: allow to
select one field in `stats_fill_sv_stats`") is backported.
diff --git a/src/stats.c b/src/stats.c
index c748c7d..1d5aa84 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -2070,7 +2070,6 @@
 			case ST_F_MODE:
 				metric = mkf_str(FO_CONFIG|FS_SERVICE, proxy_mode_str(px->mode));
 			case ST_F_QCUR:
-				break;
 				metric = mkf_u32(0, sv->nbpend);
 				break;
 			case ST_F_QMAX: