Remove unneeded style-class.

data/stylesheet.css

@@ -40,12 +40,6 @@ padding-left: 24px;
 padding-right: 24px;
 }
 
-.openweather-provider {
-border-width: 0px;
-border-radius:5px;
-padding:5px;
-}
-
 .openweather-current-summarybox,
 .openweather-forecast-icon,
 .openweather-current-databox-captions,

src/extension.js

@@ -930,7 +930,6 @@ class OpenweatherMenuButton extends PanelMenu.Button {
             this._urlButton.connect('notify::hover', Lang.bind(this, this._onButtonHoverChanged));
             this._urlButton.style_class = 'popup-menu-item';
         }
-        this._urlButton.style_class += ' openweather-provider';
 
         this._urlButton.connect('clicked', Lang.bind(this, function() {
             this.menu.actor.hide();