Fix the loading of alternative skins

Closes #1392

SABnzbd.py

@@ -280,9 +280,9 @@ def identify_web_template(key, defweb, wdir):
 
 def check_template_scheme(color, web_dir):
     """ Check existence of color-scheme """
-    if color and os.path.exists(os.path.join(web_dir, 'static/stylesheets/colorschemes/' + color + '.css')):
+    if color and os.path.exists(os.path.join(web_dir, 'static', 'stylesheets', 'colorschemes', color + '.css')):
         return color
-    elif color and os.path.exists(os.path.join(web_dir, 'static/stylesheets/colorschemes/' + color)):
+    elif color and os.path.exists(os.path.join(web_dir, 'static', 'stylesheets', 'colorschemes', color)):
         return color
     else:
         return ''