style: 更新样式

Author: ArgoZhang

src/BootstrapBlazor/Components/Split/Split.razor.scss

@@ -125,7 +125,7 @@
                     height: 2px;
 
                     &:not(:first-child) {
-                        margin-left: 0;
+                        margin-inline-start: 0;
                         margin-block-start: 4px;
                     }
                 }