fix: SearchBar 搜索栏组件的输入框无法水平居中对齐 (#408)

* 设置:hasSearchButton为false时.search-input的外边距导致输入框无法水平居中对齐

* 设置:hasSearchButton为false时.search-input的外边距导致输入框无法水平居中对齐

* Update .gitignore

Co-authored-by: fengsi <ifengjin@qq.com>

src/packages/searchbar/searchbar.scss

@@ -5,7 +5,6 @@
   .search-input {
     flex: 1;
     padding-left: 10px;
-    margin-right: 10px;
     background-color: $light-color;
     border-radius: 20px;
     overflow: hidden;
@@ -48,6 +47,7 @@
     display: inline-flex;
     align-items: center;
     justify-content: center;
+    margin-left: 10px;
     color: $title-color;
   }
   a {