Fix WebDriverException when binary is set, but no firefox binary on t…

…he PATH. (#5039)

The cause of the problem is to call the orElse method with new instance of FirefoxBinary as argument,
which requires Firefox binary in environment variable PATH.

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

@@ -215,7 +215,7 @@ public FirefoxOptions setBinary(String path) {
    * useful when actually starting firefox.
    */
   public FirefoxBinary getBinary() {
-    return getBinaryOrNull().orElse(new FirefoxBinary());
+    return getBinaryOrNull().orElseGet(FirefoxBinary::new);
   }
 
   public Optional<FirefoxBinary> getBinaryOrNull() {