Replace `tests_old_dir` by PWD

Replace `tests_old_dir` by PWD for tests in the same series.

Overlap/Tests/short_tests.json

@@ -598,8 +598,8 @@
 	],
 	"required":
 	[
-	    "$tests_old_dir/EGr2nd15md4np3_cyclo/edgelist.csv",
-	    "$tests_old_dir/EGr2nd15md4np3_cyclo/node_id_param.json"
+	    "$PWD/EGr2nd15md4np3_cyclo/edgelist.csv",
+	    "$PWD/EGr2nd15md4np3_cyclo/node_id_param.json"
 	]
     },
     {
@@ -610,8 +610,8 @@
 	],
 	"required":
 	[
-	    "$tests_old_dir/EGr2nd15md4np3/edgelist.csv",
-	    "$tests_old_dir/EGr2nd15md4np3/node_id_param.json"
+	    "$PWD/EGr2nd15md4np3/edgelist.csv",
+	    "$PWD/EGr2nd15md4np3/node_id_param.json"
 	]
     },
     {
@@ -624,8 +624,8 @@
 	],
 	"required":
 	[
-	    "$tests_old_dir/EGr2nd15md4np3/edgelist.csv",
-	    "$tests_old_dir/EGr2nd15md4np3/node_id_param.json"
+	    "$PWD/EGr2nd15md4np3/edgelist.csv",
+	    "$PWD/EGr2nd15md4np3/node_id_param.json"
 	]
     },
     {