[FIX] web,account,google_calendar: chasing breaking spaces

Before this commit, some breaking spaces were present in the js code.
Such spaces are misinterpreted and worked by luck.

This has become a problem with exported js bunldes (e.g. the
external_lib bundle in im_livechat).

This commit replaces breaking spaces by regular spaces.

addons/web/static/tests/fields/upgrade_fields_tests.js

@@ -56,7 +56,7 @@ QUnit.module('upgrade_fields', {
             "the upgrade label shouldn't be inside the field section");
         assert.strictEqual(form.$('.o_label .label').length, 1,
             "the upgrade label should be inside the label section");
-        assert.strictEqual(form.$('.o_label').text(), "Bar EnterpriseCoucou",
+        assert.strictEqual(form.$('.o_label').text(), "Bar EnterpriseCoucou",
             "the upgrade label should be inside the label section");
         form.destroy();
     });