fix(cloudant): fix structure of elemMatch query

Fix structure of elemMatch query to use:
{"field":{"$elemMatch":{"$eq":value}}}
Instead of wrong:
{"$elemMatch":{"field":{"$eq":value}}}

Signed-off-by: Gaurav Mishra <mishra.gaurav@siemens.com>

Author: GMishx

libraries/datahandler/src/main/java/org/eclipse/sw360/datahandler/cloudantclient/DatabaseConnectorCloudant.java

@@ -785,7 +785,7 @@ public boolean contains(@NotNull String docId) {
      * @return New selector
      */
     public static @NotNull Map<String, Object> elemMatch(String field, String value) {
-        return Collections.singletonMap("$elemMatch",
-                eq(field, value));
+        return Collections.singletonMap(field,
+                eq("$elemMatch", value));
     }
 }