Enable remote module in tests (#739)

In Electron v10 it defaults to false, so enable it for tests like we do with nodeIntegration, etc.

Author: Ben Demboski

lib/test-support/index.js

@@ -37,6 +37,7 @@ function openTestWindow(emberAppDir) {
       backgroundThrottling: false,
       contextIsolation: false,
       nodeIntegration: true,
+      enableRemoteModule: true,
     },
   });