remove hardcoded test variables

Author: joshedney

tools/fastlane-plugin/spec/send_build_to_bugsnag_spec.rb

@@ -113,7 +113,7 @@ def run_with args
       end
 
       it "multiple key:value pairs added as a hash" do
-        expect(Kernel).to receive(:system).with("#{BUGSNAG_CLI_PATH} create-build --api-key 12345678901234567890123456789DDD --version-name 4.0-project --bundle-version 22 --builder-name #{BUILDER} --revision #{GIT_REVISION} --repository https://github.com/bugsnag/bugsnag-dsym-upload --metadata \"custom_field_1\"=\"value1\", \"custom_field_2\"=\"value2\"").and_return(true)
+        expect(Kernel).to receive(:system).with("#{BUGSNAG_CLI_PATH} create-build --api-key 12345678901234567890123456789DDD --version-name 4.0-project --bundle-version 22 --builder-name #{BUILDER} --revision #{GIT_REVISION} --repository https://github.com/bugsnag/bugsnag-dsym-upload --metadata \"custom_field_1\"=\"value1\",\"custom_field_2\"=\"value2\"").and_return(true)
         Dir.chdir(File.join(FIXTURE_PATH, 'ios_proj')) do
           run_with({
                      app_version: '4.0-project',