MEDIUM: stream: don't call stream_store_counters() in kill_mini_session() nor session_accept()

This one is not needed anymore since we cannot track the stream counters
prior to reaching these locations. Only session counters may be tracked
and they're properly committed during session_free().
diff --git a/src/stream.c b/src/stream.c
index b3eba12..47310f5 100644
--- a/src/stream.c
+++ b/src/stream.c
@@ -238,7 +238,6 @@
 	task_free(t);
  out_free_strm:
 	p->feconn--;
-	stream_store_counters(s);
 	pool_free2(pool2_stream, s);
  out_free_sess:
 	session_free(sess);
@@ -338,7 +337,6 @@
 	conn_free(conn);
 
 	sess->fe->feconn--;
-	stream_store_counters(s);
 
 	if (!(sess->listener->options & LI_O_UNLIMITED))
 		actconn--;