fix(@angular/cli): removes redundant rules from tslint.json (angular#5783)

Fixes angular#5755

Author: dave11mj

packages/@angular/cli/blueprints/ng/files/tslint.json

@@ -42,7 +42,6 @@
     ],
     "no-construct": true,
     "no-debugger": true,
-    "no-duplicate-variable": true,
     "no-empty": false,
     "no-empty-interface": true,
     "no-eval": true,