Remove number validation from install view

Allows our special cased test numbers to link desktop clients.

// FREEBIE

js/views/install_view.js

@@ -89,9 +89,6 @@
         },
         confirmNumber: function(number) {
             var parsed = libphonenumber.parse(number);
-            if (!libphonenumber.isValidNumber(parsed)) {
-                throw new Error('Invalid number ' + number);
-            }
             this.$('#step4 .number').text(libphonenumber.format(
                 parsed,
                 libphonenumber.PhoneNumberFormat.INTERNATIONAL