tc-testing: unbreak full listing of tdc testcases

the following command currently fails:

 [root@fedora tc-testing]# ./tdc.py -l
 The following test case IDs are not unique:
 {'6f5e'}
 Please correct them before continuing.

this happens because there are two tests having the same id:

 [root@fedora tc-testing]# grep -r 6f5e tc-tests/*
 tc-tests/actions/pedit.json:        "id": "6f5e",
 tc-tests/filters/basic.json:        "id": "6f5e",

fix it replacing the latest duplicate id with a brand new one:

 [root@fedora tc-testing]# sed -i 's/6f5e//1' tc-tests/filters/basic.json
 [root@fedora tc-testing]# ./tdc.py -i

Fixes: 4717b053 ("tc-testing: Introduced tdc tests for basic filter")
Signed-off-by: NDavide Caratti <dcaratti@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/tc-testing/tc-tests/filters/basic.json

@@ -152,7 +152,7 @@
         ]
     },
     {
-        "id": "6f5e",
+        "id": "b99c",
         "name": "Add basic filter with cmp ematch u8/transport layer and default action",
         "category": [
             "filter",