add declaration for private field in syntax error test

javascript/ql/test/query-tests/LanguageFeatures/SyntaxError/SyntaxError.expected

@@ -1,4 +1,4 @@
 | arrows.js:1:5:1:5 | Error: Argument name clash | Error: Argument name clash |
-| destructingPrivate.js:3:6:3:6 | Error: Unexpected token | Error: Unexpected token |
+| destructingPrivate.js:2:12:2:12 | Error: Unexpected token | Error: Unexpected token |
 | privateMethod.js:2:3:2:3 | Error: Only fields, not methods, can be declared private. | Error: Only fields, not methods, can be declared private. |
 | tst.js:2:12:2:12 | Error: Unterminated string constant | Error: Unterminated string constant |

javascript/ql/test/query-tests/LanguageFeatures/SyntaxError/destructingPrivate.js

@@ -1,4 +1,5 @@
 class C {
+  #privDecl;
   bar() {
     {#privDecl} = this;
   }