Fix test for new lock format

tests/Composer/Test/Fixtures/installer/install-dev-using-dist.test

@@ -30,9 +30,15 @@ install --prefer-dist
 {
     "packages": [
         {
+            "name": "a/a",
             "version": "dev-master",
-            "package": "a/a",
-            "source-reference": "459720ff3b74ee0c0d159277c6f2f5df89d8a4f6"
+            "dist": {
+                "type": "zip",
+                "url": "http://www.example.com/dist.zip",
+                "reference": "459720ff3b74ee0c0d159277c6f2f5df89d8a4f6",
+                "shasum": null
+            },
+            "type": "library"
         }
     ],
     "packages-dev": null,