fix(es/proposal): Fix var placement for using transform (#8732)

**Related issue:**

 - Closes #8629

Author: kdy1

crates/swc/tests/fixture/issues-8xxx/8629/input/.swcrc

@@ -0,0 +1,22 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "typescript",
+            "decorators": true
+        },
+        "target": "es2015",
+        "loose": false,
+        "minify": {
+            "compress": false,
+            "mangle": false
+        },
+        "transform": {
+            "decoratorVersion": "2022-03"
+        }
+    },
+    "module": {
+        "type": "es6"
+    },
+    "minify": false,
+    "isModule": true
+}

crates/swc/tests/fixture/issues-8xxx/8629/input/1.js

@@ -0,0 +1,9 @@
+export class Disposable {
+    [Symbol.dispose]() {
+        console.log('dispose')
+    }
+}
+
+using _disposable = new Disposable()
+
+console.log('ok')