fix (node-delta-sharing): Fix error in delta_sharing example config

Signed-off-by: Ritesh.K <riteshkarki6@gmail.com>

Author: RiteshKarki27

etc/examples/nodes/delta_sharing.conf

@@ -3,23 +3,15 @@
 nodes  = {
     delta_reader  = {
         type  = "delta_sharing"
-        profile_path = "${TEST_PROFILE}"
-        cache_dir = "${TEST_CACHE}"
+        profile_path = "."
+        cache_dir = "."
         table_path = "open-datasets.share#delta_sharing.default.COVID_19_NYT",
         op = "read"
         batch_size = 10
     },
-    delta_writer = {
-        type = "delta_sharing",
-        profile_path = "${TEST_PROFILE}"
-        cache_dir = "${TEST_CACHE}"
-        table_path = "open-delta-sharing.s3.us-west-2.amazonaws.com#samples.test_output",
-        op = "write"
-        batch_size = 10
-    },
     file1 = {
         type = "file"
-        uri = "${TEST_OUTPUT}"
+        uri = "."
         format = "json"
     }
 }