delete ListDiff scheme

[tatsuya-yamamoto-nm]

without deleting the scheme, you cannot compile when carthage build.

*** Building scheme "DifferenceKit" in DifferenceKit.xcworkspace
A shell task (/usr/bin/xcrun xcodebuild -project /Users/tatsuya.yamamoto/Documents/nm-media-dev/Matching-iPhone/Carthage/Checkouts/DataSources/DataSources.xcodeproj -scheme ListDiff -configuration Release CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY= CARTHAGE=YES archive -showBuildSettings -skipUnavailableActions) failed with exit code 6:
2023-06-30 12:08:37.026 xcodebuild[60916:3282420] [MT] DVTAssertions: ASSERTION FAILURE in /System/Volumes/Data/SWE/Apps/DT/BuildRoots/BuildRoot2/ActiveBuildRoot/Library/Caches/com.apple.xbs/Sources/IDEFrameworks/IDEFrameworks-21534/IDEFoundation/Execution/RunDestinations/IDERunDestinationCLI.m:566
Details:  Unhandled/unexpected case where no run destinations were produced.
Object:   <IDERunDestinationCLI>
Method:   +resolveRunDestinationsWithWorkspace:scheme:buildAction:schemeCommand:schemeTask:destinationSpecifications:architectures:timeout:runDestinationManager:deviceManager:fallbackPreferredSDK:fallbackPreferredArchitectures:skipUnsupportedDestinations:shouldSkipRunDestinationValidation:didDisambiguate:disambiguatedMatches:disambiguatedMatchesDescription:error:
Thread:   <_NSMainThread: 0x600000ff4280>{number = 1, name = main}
Hints: 

Backtrace:
  0   -[DVTAssertionHandler handleFailureInMethod:object:fileName:lineNumber:assertionSignature:messageFormat:arguments:] (in DVTFoundation)
  1   _DVTAssertionHandler (in DVTFoundation)
  2   _DVTAssertionFailureHandler (in DVTFoundation)
  3   _sortDevicesForDisplay (in IDEFoundation)
  4   -[Xcode3CommandLineBuildTool _resolveRunDestinationsForBuildAction:] (in Xcode3Core)
  5   -[Xcode3CommandLineBuildTool _resolveInputOptionsWithTimingSection:] (in Xcode3Core)
  6   -[Xcode3CommandLineBuildTool run] (in Xcode3Core)
  7   XcodeBuildMain (in libxcodebuildLoader.dylib)
  8   start (in dyld)