fix(ImagePicker):修复内容不居中，方案改为第一个元素margin置为0

Author: zoney

src/style/components/image-picker.scss

@@ -14,7 +14,6 @@
     padding: $spacing-h-sm;
     overflow: hidden;
     box-sizing: border-box;
-    margin-left: -$spacing-h-sm;
   }
 
   &__flex-item {
@@ -24,6 +23,10 @@
     height: 100%;
     box-sizing: border-box;
 
+    &:nth-child(1) {
+      margin-left: 0 !important;
+    }
+
     &::after {
       content: '';
       display: block;