Fix mac notarized build archiving wrong platform

build_mac_app in the build_and_notarize lane was missing the sdk and
destination overrides needed for the multiplatform scheme, so gym
archived for tvOS and failed on provisioning profiles. Mirror the
working mac beta lane.

fastlane/Fastfile

@@ -328,6 +328,8 @@ platform :mac do
 
     build_mac_app(
       scheme: SCHEME,
+      sdk: "macosx",
+      destination: "generic/platform=macOS",
       configuration: "Release-DeveloperID",
       output_directory: "fastlane/builds/#{version}-#{build}/macOS",
       output_name: APP_NAME,