fix(steps): fix style

Author: liweijie0812

style/web/components/steps/_mixin.less

@@ -213,7 +213,7 @@
         width: 9999px;
         border-left: 0;
         border-top: 0;
-        border-bottom-width: @step-stroke-width;
+        border-bottom-width: @steps-line-height;
         border-bottom-color: @steps-line-bg-color-horizontal-default;
         position: absolute;
         left: 100%;
@@ -318,7 +318,7 @@
           height: 100%;
           border-left: 0;
           border-top: 0;
-          border-right-width: @steps-item-icon-number-line-width;
+          border-right-width: @steps-line-width;
           border-right-color: @steps-line-bg-color-vertical-default;
           position: absolute;
           top: @steps-item-icon-number-line-top;
@@ -340,7 +340,7 @@
           height: 100%;
           border-left: 0;
           border-bottom: 0;
-          border-right-width: @steps-item-icon-number-line-width;
+          border-right-width: @steps-line-width;
           border-right-color: @steps-line-bg-color-vertical-default;
           position: absolute;
           top: @steps-item-icon-number-line-top;
@@ -399,7 +399,7 @@
         width: @steps-item-connector-line-width;
         border-left: 0;
         border-top: 0;
-        border-bottom-width: @steps-item-icon-number-line-height;
+        border-bottom-width: @steps-line-width;
         border-bottom-color: @steps-line-dot-bg-color-vertical-default;
         position: absolute;
         left: @steps-dot-connector-position-left-horizontal;
@@ -467,7 +467,7 @@
           height: 100%;
           border-bottom: 0;
           border-left: 0;
-          border-right-width: @steps-item-icon-number-line-height;
+          border-right-width: @steps-line-width;
           border-right-color: @steps-line-dot-bg-color-vertical-default;
           position: absolute;
           left: @steps-dot-connector-position-left-vertical;