feat(editor): disable spellcheck (#2186)

When editing, if the browser has enabled spell checking, red wavy lines may appear on some words, which should be unnecessary. Simply disable it. If there is a need later, consider passing parameters to enable it.

src/client/theme-default/slots/SourceCodeEditor/index.tsx

@@ -89,6 +89,7 @@ const SourceCodeEditor: FC<ISourceCodeEditorProps> = (props) => {
               autoComplete="off"
               autoCorrect="off"
               autoSave="off"
+              spellcheck="false"
             />
           )
         }