fix(Modal): add show style in multiple dialog mode (#5617)

* doc: 代码格式化

* refactor: 增加缺失样式

Author: ArgoZhang

src/BootstrapBlazor/Components/Modal/Modal.razor

@@ -3,7 +3,8 @@
 @attribute [BootstrapModuleAutoLoader(JSObjectReference = true)]
 
 <BootstrapBlazorRootContent>
-    <div @attributes="@AdditionalAttributes" class="@ClassString" tabindex="-1" role="dialog" data-bs-backdrop="@Backdrop" data-bs-keyboard="@KeyboardString" id="@Id">
+    <div @attributes="@AdditionalAttributes" class="@ClassString" tabindex="-1" role="dialog" id="@Id"
+         data-bs-backdrop="@Backdrop" data-bs-keyboard="@KeyboardString">
         <CascadingValue Value="this" IsFixed="true">
             @ChildContent
         </CascadingValue>

src/BootstrapBlazor/Components/Modal/Modal.razor.js

@@ -50,6 +50,7 @@ export function init(id, invoke, shownCallback, closeCallback) {
             modal.modal._config.backdrop = 'static'
 
             modal.handlerKeyboardAndBackdrop()
+            el.classList.add('show');
         }
     }