Do not uppercase the SponsorBlock categories

Avoid the `text-transform` on `label` by simply not using that tag.

Anyone who is better with CSS than I am, with an improved solution, is welcome to create a pull request.

tubesync/sync/templates/widgets/checkbox_option.html

@@ -1,7 +1,7 @@
 <!--<input type="{{ option.type }}" name="{{ option.name }}" value="{{ option.value }}" id="{{ option.value }}"><BR>
     <label for="{{ option.value }}">{{option.label}}</label>-->
 
-<label>
+<div>
     <input type="{{ option.type }}" name="{{ option.name }}" value="{{ option.value }}" id="{{ option.value }}" {% if option.selected %}checked{% endif %}>
     <span>{{option.label}}</span>
-</label>
+</div>