fix: Fixed dispatching of URL for worker in remote content mode

* When worker was in remote content mode, then yggdrasil still
  expects raw data as valid JSON document. URL like:
  http://example.com/ is not valid JSON document. It could be
  e.g. "http://example.com/"
* Not sure if this is the best solution, but it solves the issue
  described in issue #208

internal/work/dispatcher.go

@@ -205,9 +205,17 @@ func (d *Dispatcher) Dispatch(data yggdrasil.Data) error {
 	}
 
 	if r.Value().(bool) {
-		URL, err := url.Parse(string(data.Content))
+		// The type of data.Content is raw string, but it has to be valid JSON document.
+		// It means that it has to be something like '"http://example.com"' and
+		// not only 'http://example.com'
+		rawUrlStr := string(data.Content)
+		if rawUrlStr[0] != '"' && rawUrlStr[len(rawUrlStr)-1] != '"' {
+			return fmt.Errorf("data (containing URL) not encapsulated by quotation marks")
+		}
+		urlStr := rawUrlStr[1 : len(rawUrlStr)-1]
+		URL, err := url.Parse(urlStr)
 		if err != nil {
-			return fmt.Errorf("cannot parse content as URL: %v", err)
+			return fmt.Errorf("cannot parse content %v as URL: %v", urlStr, err)
 		}
 		if config.DefaultConfig.DataHost != "" {
 			URL.Host = config.DefaultConfig.DataHost