fix(electron): added salt prefix to check connectivity

[mortezabahrami]

The checkConnectivity method didn't check for salt prefixes, so the connection would never get established in countries where Outline doesn't work without a salt prefix.

[fortuna]

Great catch! Thanks for your contribution.

@daniellacosse @jyyi1 we'll need another Electron client release to get this out.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c736f8d) 35.95% compared to head (0dce05f) 35.95%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1599   +/-   ##
=======================================
  Coverage   35.95%   35.95%           
=======================================
  Files          45       45           
  Lines        2506     2506           
  Branches      308      308           
=======================================
  Hits          901      901           
  Misses       1605     1605           

Flag	Coverage Δ
apple	2.27% <ø> (ø)
ios	2.30% <ø> (ø)
macos	2.29% <ø> (ø)
unittests	35.95% <ø> (ø)
www	45.89% <ø> (ø)

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