Removed !important from userstyles.php 

Hi Mark,

In testing this block we found that if the user had previously saved font size settings, then the `!important` on the setting loaded in userstyles.php prevented any visible change when the font size buttons were clicked. 

The CSS from userstyles.php, for example: 
    #page {
        font-size: 93% !important;
    }

Even though the local style is written by JS to the `#page` element, it can't override that `!important`:
    <div id="page" style="font-size: 85%;">

It looks like a previous commit removed the `!important`s from module.js. Perhaps they should be removed from userstyles.php as well? 

Regards,
Amy