bazel build //clusterers:stats-in-memory_main fails

[adsharma]

ParAlg/gbbs@ae883e7 removed sym_graph_from_edges.

But there are some dangling references here that break the build:

ParClusterers/clusterers/stats/stats_utils.h

Lines 101 to 103 in 31b882f

	return gbbs::sym_graph_from_edges(subgraph_edges, graph_.Graph()->n);
	}else{
	return gbbs::sym_graph_from_edges(subgraph_edges, n);