Fix Cloudwatch query sorting

[StuartBertram]

This should fix #9818. It inverts the sorting boolean and updates the query tests to match.

I don't think it should impact anything else. And I'm hoping that some automated test runs will confirm that.

[bblommers]

Hi @StuartBertram! We do have some automated tests, and it looks like one other test should be fixed with this change - happy to merge once that's done

[StuartBertram]

Okay, I think that should fix it. I'd had a quick look at the Boto tests, but I assumed it would be doing the right thing because it was Boto. But I guess it's a mocked function, so it's Boto querying Moto, which hits the function that I've just edited!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.11%. Comparing base (dc425e8) to head (5084bd3).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9819   +/-   ##
=======================================
  Coverage   93.11%   93.11%           
=======================================
  Files        1308     1308           
  Lines      118823   118862   +39     
=======================================
+ Hits       110645   110684   +39     
  Misses       8178     8178           

Flag	Coverage Δ
servertests	28.89% <50.00%> (-0.01%)	⬇️
unittests	93.09% <100.00%> (+<0.01%)	⬆️

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