build: this removes old unused sentry variables

fastlane/Fastfile

 ENV["MATCH_GIT_URL"] = "ssh://git@gitlab.akamu.de:26/vorstand/ios-match-certificate.git"
 ENV["FASTLANE_OUTPUT_DIRECTORY"] = "fastlane/output"
-ENV["SENTRY_ORG_SLUG"] = "akamu"
-ENV["SENTRY_PROJECT_SLUG"] = "ios-client"
-
-@sentry_org = ENV["SENTRY_ORG_SLUG"]
-@sentry_project = ENV["SENTRY_PROJECT_SLUG"]
 
 @output_directory = ENV["FASTLANE_OUTPUT_DIRECTORY"]
 # git url of match