Refactor the initTabs function

[einazare]

• When overriding the deafult classes by calling again the initTabs funtion, another event listener will be added for all the tabs, make this only happen for those overriden tabs
• Change the active classes object, maybe you will have to change normal classes object as well
  The issue is that, the following code:

  let activeElement = ulElement.querySelector("li > a" + queryActiveClasses);

Has errors if the queryActiveClasses is an array with more than one class:
Example:

queryActiveClasses === [".class-1",".class-2"];
// then
"li > a" + queryActiveClasses === "li > a.class-1,.class-2"
// should be
"li > a" + queryActiveClasses === "li > a.class-1.class-2"

Notice the comma.