fix: do not dispose model manually

Author: HaydenOrz

src/diff.tsx

@@ -132,10 +132,7 @@ class MonacoDiffEditor extends React.Component<MonacoDiffEditorProps> {
 
     destroyMonaco() {
         if (this.diffEditor) {
-            const { original, modified } = this.diffEditor.getModel();
             this.diffEditor.dispose();
-            original.dispose();
-            modified.dispose();
             this.subscription?.dispose();
         }
     }

src/editor.tsx

@@ -156,7 +156,6 @@ class MonacoEditor extends React.Component<MonacoEditorProps> {
 
     destroyMonaco() {
         if (this.editor) {
-            this.editor?.getModel()?.dispose();
             this.editor?.dispose();
             this._blurSubscription?.dispose();
             this._focusSubscription?.dispose();