DSN#server shouldn't include path

[st0012]

The path will be applied to DSN#envelope_endpoint anyway, so if #server also contains the path it'll be repeated.

[codecov-commenter]

Codecov Report

Merging #1505 (913e1d5) into master (6cc8966) will increase coverage by 0.56%.
The diff coverage is 100.00%.

❗ Current head 913e1d5 differs from pull request most recent head 8f8aca4. Consider uploading reports for the commit 8f8aca4 to get more accurate results

@@            Coverage Diff             @@
##           master    #1505      +/-   ##
==========================================
+ Coverage   98.21%   98.78%   +0.56%     
==========================================
  Files         218      123      -95     
  Lines       10560     6722    -3838     
==========================================
- Hits        10372     6640    -3732     
+ Misses        188       82     -106     

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry/dsn.rb	100.00% <ø> (ø)
sentry-ruby/spec/sentry/dsn_spec.rb	100.00% <100.00%> (ø)
...-ruby/spec/sentry/transport/http_transport_spec.rb	100.00% <100.00%> (ø)
sentry-rails/lib/sentry/rails/active_job.rb	97.05% <0.00%> (-0.09%)	⬇️
sentry-rails/lib/sentry/rails/configuration.rb	100.00% <0.00%> (ø)
...-sidekiq/spec/sentry/sidekiq/error_handler_spec.rb	100.00% <0.00%> (ø)
sentry-raven/spec/raven/integrations/rack_spec.rb
sentry-raven/lib/raven/integrations/rails.rb
sentry-raven/lib/raven/utils/request_id.rb
sentry-raven/lib/raven/logger.rb
... and 91 more

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