always refetch license config

see: #4931

awx/ui/client/src/license/license.controller.js

@@ -41,6 +41,7 @@ export default
             $scope.fileName = N_("No file selected.");
             $scope.title = $rootScope.licenseMissing ? ("Tower " + i18n._("License")) : i18n._("License Management");
             Wait('start');
+            ConfigService.delete();
             ConfigService.getConfig().then(function(config){
                 $scope.license = config;
                 $scope.license.version = config.version.split('-')[0];

awx/ui/tests/spec/license/license.controller-test.js

@@ -44,6 +44,7 @@ describe('Controller: LicenseController', () => {
 
     // Suites
     it('should GET a config object on initialization', ()=>{
+        expect(ConfigService.delete).toHaveBeenCalled();
         expect(ConfigService.getConfig).toHaveBeenCalled();
     });