fix some form item style

style/components/form.less

@@ -140,10 +140,14 @@ form {
   .@{css-prefix}radio-inline,
   .@{css-prefix}checkbox-inline {
     display: inline-block;
-    margin-right: 16px;
     vertical-align: middle;
     font-weight: normal;
     cursor: pointer;
+    margin-left: 16px;
+
+    &:first-child {
+      margin-left: 0;
+    }
   }
 
   .@{css-prefix}checkbox-vertical,

style/components/slider.less

@@ -11,7 +11,7 @@
 
 .@{slider-prefix-cls} {
   position: relative;
-  margin: 10px 0;
+  margin: 10px 8px;
   height: 12px;
   border-radius: 5px;
   background-color: #e9e9e9;