Simplify processes in the getter request.protocol

[initial-wu]

• Assignment to proxy before the if block is unnecessary

• When proto is falsy then assigned 'http', calling split(...) on the string is unnecessary

[codecov]

Codecov Report

Merging #1203 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1203      +/-   ##
==========================================
- Coverage   99.73%   99.73%   -0.01%     
==========================================
  Files           5        5              
  Lines         374      373       -1     
==========================================
- Hits          373      372       -1     
  Misses          1        1

Impacted Files	Coverage Δ
lib/request.js	100% <100%> (ø)	⬆️

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