refactory: remove unneeded px

Author: kenjis

admin/css/debug-toolbar/toolbar.scss

@@ -28,8 +28,8 @@
     width: 36px;
 
     // Spacing
-    margin: 0px;
-    padding: 0px;
+    margin: 0;
+    padding: 0;
 
     // Content
     clear: both;

system/Debug/Toolbar/Views/toolbar.css

@@ -13,8 +13,8 @@
   z-index: 10000;
   height: 36px;
   width: 36px;
-  margin: 0px;
-  padding: 0px;
+  margin: 0;
+  padding: 0;
   clear: both;
   text-align: center;
   cursor: pointer;