refactor: move the loginError property from Connection into Login7Handler

[arthurschreiber]

One less thing to keep track of in the Connection class itself.

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 15 lines in your changes missing coverage. Please review.

Project coverage is 85.26%. Comparing base (e1b37fb) to head (9c85630).

Files with missing lines	Patch %	Lines
src/connection.ts	23.07%	10 Missing ⚠️
src/token/handler.ts	37.50%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1662      +/-   ##
==========================================
- Coverage   85.47%   85.26%   -0.21%     
==========================================
  Files          90       90              
  Lines        4859     4858       -1     
  Branches      924      924              
==========================================
- Hits         4153     4142      -11     
- Misses        702      712      +10     
  Partials        4        4              

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