Always re-inject the chalice runtime into the zip file

[jamesls]

This ensures more seamless upgrades when new functionality is
added to the runtime (such as Response classes).

[codecov-io]

Codecov Report

Merging #245 into master will decrease coverage by -0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #245      +/-   ##
==========================================
- Coverage   79.31%   79.27%   -0.05%     
==========================================
  Files          13       13              
  Lines        1518     1515       -3     
  Branches      200      200              
==========================================
- Hits         1204     1201       -3     
  Misses        257      257              
  Partials       57       57

Impacted Files	Coverage Δ
chalice/deployer.py	71.42% <100%> (-0.2%)	❌

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