[java] Fixing FirefoxOptions copy constructor to fill all the standard capabilities for Firefox

Author: barancev

java/client/src/org/openqa/selenium/firefox/FirefoxOptions.java

@@ -97,7 +97,7 @@ public FirefoxOptions() {
 
   public FirefoxOptions(Capabilities source) {
     // We need to initialize all our own fields before calling.
-    super();
+    this();
     source.asMap().forEach((key, value)-> {
       if (value != null) {
         setCapability(key, value);