[DE] Update add-ons style.

apps/common/main/resources/less/plugins.less

@@ -29,7 +29,7 @@
                 background-color: @secondary;
 
                 .plugin-icon {
-                    .box-shadow(0 0 0 2px @primary);
+                    .box-shadow(0 0 0 2px transparent);
                 }
             }
         }
@@ -46,11 +46,12 @@
             width: 31px;
             height: 31px;
             display: inline-block;
-            .box-shadow(0 0 0 1px @gray);
+            .box-shadow(0 0 0 1px transparent);
             vertical-align: middle;
             background-position: 0 0;
             background-size: cover;
             margin-right: 10px;
+            margin-top: -1px;
 
             .background-ximage('@{common-image-path}/plugin/icon_add_on_default.png', '@{common-image-path}/plugin/icon_add_on_default@2x.png', 31px);
         }