tests: Fix malformed JSON.

Guile-JSON 4.3.2 would parse in spite of these typos, but 4.4.1 is
stricter.

* tests/swh.scm (%directory-entries): Add missing comma.
* tests/cve-sample.json: Likewise.

tests/cve-sample.json

@@ -49,7 +49,7 @@
           "vulnerable" : true,
           "cpe23Uri" : "cpe:2.3:o:juniper:junos:16.1:*:*:*:*:*:*:*"
         } ]
-      } {
+      }, {
         "operator" : "OR",
         "cpe_match" : [ {
           "vulnerable" : true,

tests/swh.scm

@@ -33,7 +33,7 @@
   "[ { \"name\": \"one\",
        \"type\": \"regular\",
        \"length\": 123,
-       \"dir_id\": 1 }
+       \"dir_id\": 1 },
      { \"name\": \"two\",
        \"type\": \"regular\",
        \"length\": 456,