fix: always initialize proxy support when running the CLI

[malept]

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Summarize your changes:

Don't expect users to set the environment variable ELECTRON_GET_USE_PROXY=1 if they need to use a proxy.

[codecov-io]

Codecov Report

Merging #1077 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1077   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files          14      14           
  Lines         694     695    +1     
======================================
+ Hits          694     695    +1

Impacted Files	Coverage Δ
src/cli.js	100% <100%> (ø)	⬆️
src/unzip.js	100% <0%> (ø)	⬆️
src/ignore.js	100% <0%> (ø)	⬆️

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