[fix] Synchro: bad search URL computation

duniter4j-core-client/src/main/java/org/duniter/core/client/service/HttpServiceImpl.java

@@ -198,7 +198,8 @@ public class HttpServiceImpl implements HttpService, Closeable, InitializingBean
     }
 
     public String getPath(Peer peer, String... absolutePath) {
-        return peer.getUrl() + pathJoiner.skipNulls().join(absolutePath).replaceAll("//+", "/");
+        String path = "/" + pathJoiner.skipNulls().join(absolutePath);
+        return peer.getUrl() + path.replaceAll("//+", "/");
     }