Remove Checkstyle suppression for SpringJUnit5 from JerseyAutoConfigurationServletContainerTests

[philwebb]

[wilkinsona]

JerseyAutoConfigurationServletContainerTests only has the implicit public default constructor at the moment. If I add a package-private default constructor the tests pass. What did you have in mind here, @philwebb?

[philwebb]

@wilkinsona Nothing in mind, it was just a test I didn't have time to investigate when adding the checkstyle rule. If that's all there is then we can just migrate it I guess.

[wilkinsona]

I've just realised that it's the public constructor on the Application inner-class that's the problem.