fix: only delete the sqs queue if it already exists in the state

[kirkness]

Initial issue: #1098 (comment)

[codecov]

Codecov Report

Merging #1147 (8d73c44) into master (fcfa05c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1147   +/-   ##
=======================================
  Coverage   82.99%   82.99%           
=======================================
  Files          95       95           
  Lines        3222     3223    +1     
  Branches      935      936    +1     
=======================================
+ Hits         2674     2675    +1     
  Misses        485      485           
  Partials       63       63           

Impacted Files	Coverage Δ
...ckages/serverless-components/aws-sqs/serverless.js	96.42% <100.00%> (+0.06%)	⬆️

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[dphang]

Thanks! Looks fine, I can merge it now but I'm on vacation until next weekend, so won't be able to publish until then