refactor: remove unused highlight-lines setting

Author: cnblogs-dudu

package.json

@@ -41,7 +41,7 @@
     ],
     "main": "./dist/extension.js",
     "contributes": {
-        "markdown.markdownItPlugins": true,        
+        "markdown.markdownItPlugins": true,
         "icons": {
             "vscode-cnb-date": {
                 "description": "date",
@@ -544,19 +544,11 @@
                         "markdownDescription": "博客园 Markdown 语法扩展: 三箭头(`>>>`)栅栏引用\n\n使用示例:\n```markdown\n>>>\n一段引用文字\n\n一段引用文字\n>>>\n```"
                     },
                     "cnblogsClient.markdown.enableImageSizing": {
-                        "order": 10,
-                        "type": "boolean",
-                        "scope": "application",
-                        "default": true,
-                        "markdownDescription": "博客园 Markdown 语法扩展: 指定图片尺寸，`![](... =200x)`指定宽度，`![](... =x200)`指定高度"
-                    },
-                    "cnblogsClient.markdown.enableHighlightCodeLines": {
                         "order": 11,
                         "type": "boolean",
                         "scope": "application",
                         "default": true,
-                        "editPresentation": "singlelineText",
-                        "markdownDescription": "博客园 Markdown 语法扩展: 代码块指定行高亮\n\n使用示例:\n```markdown\n```typescript {1, 3-4}\nconst a = 1\nconst b = 2\nconst c = a + b\nconst d = c\nconst e = 0\n```\n```"
+                        "markdownDescription": "博客园 Markdown 语法扩展: 指定图片尺寸，`![](... =200x)`指定宽度，`![](... =x200)`指定高度"
                     },
                     "cnblogsClient.markdown.showConfirmMsgWhenUploadPost": {
                         "order": 12,