Escape Creator Helix argument

[jjonescz]

Without the change I get an error like this when manually queueing a roslyn-CI build (example):

MSBUILD : error MSB1008: Only one project can be specified.
    Full command line: '/mnt/vss/_work/1/s/.dotnet/sdk/9.0.100/MSBuild.dll -maxcpucount -verbosity:m -tlp:default=auto -nologo -restore -consoleloggerparameters:Summary --property:Creator=Jan -bl:/mnt/vss/_work/1/s/artifacts/log/Debug/helix.binlog /mnt/vss/_work/1/s/artifacts/helix.proj Jones'
  Switches appended by response files:
Switch: Jones