[now dev] Increase default maxLambdaSize

[thasophearak]

This PR add maxLambdaSize 50mb for now dev.

Related:

• https://github.com/zeit/docs/pull/985
• https://github.com/zeit/now-builders/pull/741

[codecov-io]

Codecov Report

Merging #2534 into canary will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           canary   #2534      +/-   ##
=========================================
- Coverage   13.02%     13%   -0.02%     
=========================================
  Files         256     256              
  Lines        9354    9343      -11     
  Branches     1061    1057       -4     
=========================================
- Hits         1218    1215       -3     
+ Misses       8016    8009       -7     
+ Partials      120     119       -1

Impacted Files	Coverage Δ
src/util/dev/builder.ts	75.46% <ø> (+0.76%)	⬆️
src/util/dev/builder-cache.ts	71.9% <0%> (+1.5%)	⬆️
src/util/metrics.ts	68.18% <0%> (+6.64%)	⬆️

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