fix(测试跟踪): 富文本框添加图片链接遮罩层无法遮盖

--bug=1015255 --user=陈建星 【测试跟踪】测试计划-添加缺陷，点击“添加图片链接”，页面显示需优化 https://www.tapd.cn/55049933/s/1208936

frontend/src/business/components/track/case/components/FormRichTextItem.vue

@@ -26,7 +26,4 @@ export default {
 </script>
 
 <style scoped>
-/deep/ .v-note-wrapper {
-  position: initial;
-}
 </style>

frontend/src/business/components/track/case/components/MsMarkDownText.vue

@@ -210,7 +210,8 @@ export default {
 <style scoped>
 
 /deep/ .v-note-wrapper {
-  position: initial;
+  display: block !important;
+  position: static !important;
 }
 
 /deep/ .dropdown-item.dropdown-images {