remove hardcoded source

Author: jnke2016

python/cugraph/cugraph/tests/traversal/test_sssp.py

@@ -519,8 +519,6 @@ def test_sssp_csr_graph(graph_file):
 
     source = G_coo.select_random_vertices(num_vertices=1)[0]
 
-    source = 20
-
     print("source = ", source)
 
     G_csr.from_cudf_adjlist(offsets, indices, weights)
@@ -540,8 +538,6 @@ def test_sssp_csr_graph(graph_file):
     distance_diffs = result_sssp.query("distance_csr != distance_coo")
     predecessor_diffs = result_sssp.query("predecessor_csr != predecessor_coo")
 
-    print("result_sssp = \n", result_sssp)
-
     assert len(distance_diffs) == 0
     assert len(predecessor_diffs) == 0