fix: the width of the code input type is not full (#838)

#### What type of PR is this?
/kind bug


#### What this PR does / why we need it:
修复 Console 端 FormKit 的 Code 输入类型宽度异常

#### Which issue(s) this PR fixes:

Fixes # https://github.com/halo-dev/halo/issues/3227

#### Special notes for your reviewer:

#### Does this PR introduce a user-facing change?

```release-note
修复 Console 端 FormKit 的 Code 输入框宽度未占满的问题
```

packages/components/src/components/codemirror/Codemirror.vue

@@ -45,6 +45,7 @@ const emit = defineEmits<{
 const customTheme = EditorView.theme({
   "&": {
     height: props.height,
+    width: "100%",
   },
 });