refactor: 精简样式代码

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Components/Header.razor.css

@@ -66,24 +66,16 @@
 ::deep .bb-g-search {
     --bs-border-color: var(--bb-header-dropdown-border-color);
     --bb-border-hover-color: var(--bb-header-dropdown-border-hover-color);
+    --bb-global-search-input-color: var(--bb-header-dropdown-color);
     width: var(--bb-header-select-width);
     margin-block-end: var(--bb-header-search-margin-bottom);
-    color: var(--bb-header-dropdown-color);
     font-size: 0.875rem;
 }
 
-    ::deep .bb-g-search .search-dialog-icon {
-        font-size: 0.875rem;
-    }
-
     ::deep .bb-g-search > input {
         padding: 2px 0;
     }
 
-        ::deep .bb-g-search > input::placeholder {
-            color: var(--bb-header-dropdown-color);
-        }
-
 @media (min-width: 768px) {
     .navbar-header {
         position: sticky;