BUG/MEDIUM: peers: fix some track counter rules dont register entries for sync.

This BUG was introduced with:
'MEDIUM: threads/stick-tables: handle multithreads on stick tables'

The API was reviewed to handle stick table entry updates
asynchronously and the caller must now call a 'stkable_touch_*'
function each time the content of an entry is modified to
register the entry to be synced.

There was missing call to stktable_touch_* resulting in
not propagated entries to remote peers (or local one during reload)
diff --git a/include/proto/session.h b/include/proto/session.h
index d63d29e..f48c0d4 100644
--- a/include/proto/session.h
+++ b/include/proto/session.h
@@ -62,6 +62,9 @@
 			stktable_data_cast(ptr, conn_cur)--;
 
 			HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
+
+			/* If data was modified, we need to touch to re-schedule sync */
+			stktable_touch_local(stkctr->table, ts, 0);
 		}
 
 		stkctr_set_entry(stkctr, NULL);