CMake: Set macOS deployment options on ladybird to quiet Xcode

When using the Xcode generator, Xcode complains about a mismatch
between CMake and the plist file for the application name.

It also complains that we're not using codesign properly, so just
disable codesign altogether.

CMakeLists.txt

@@ -72,12 +72,14 @@ target_include_directories(ladybird PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 target_include_directories(ladybird PRIVATE ${SERENITY_SOURCE_DIR}/Userland/Services/)
 
 set_target_properties(ladybird PROPERTIES
-    MACOSX_BUNDLE_GUI_IDENTIFIER org.serenityos.ladybird
+    MACOSX_BUNDLE_GUI_IDENTIFIER org.SerenityOS.Ladybird
     MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
     MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
     MACOSX_BUNDLE_INFO_PLIST "${CMAKE_CURRENT_SOURCE_DIR}/Info.plist"
     MACOSX_BUNDLE TRUE
     WIN32_EXECUTABLE TRUE
+    XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY ""
+    XCODE_ATTRIBUTE_CODE_SIGNING_ALLOWED "NO"
 )
 
 if (ANDROID)