Filters message tweak & tutorial opens filter tab

I made optionTutorial open the filters tab if it wasn't already open. This ensures that the tutorial text has enough space to display.

I also changed the tutorial text for the filters.

Another option might be to change the ok button text to "next" and display a second message onclick. I could imagine the tutorial opening the category tab, covering only the bit underneath the tab, and then on next, opening the filters tab. That way there would even be space to say that the "clear" and "toggle" menu options respect the filters.