[gnome-shell] tests: Fix JS warning

[Florian Müllner <fmuellner src gnome org>]

commit d439456048ac9f9a73ff66c0b214e661b98964db
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Oct 4 18:10:35 2017 +0200

    tests: Fix JS warning

 tests/unit/jsParse.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/unit/jsParse.js b/tests/unit/jsParse.js
index ed550c9..3814848 100644
--- a/tests/unit/jsParse.js
+++ b/tests/unit/jsParse.js
@@ -176,7 +176,7 @@ for (let i = 0; i < testsModifyScope.length; i++) {
 
         let matches = text.match(/(.*)\.(.*)/);
         if (matches) {
-            [expr, base, attrHead] = matches;
+            let [expr, base, attrHead] = matches;
 
             if (!JsParse.isUnsafeExpression(base)) {
                 with (obj) {