Fix validator preparation-mode flag

[TravisStark]

Description of the issue

Missing space in validator command arguments

Description of changes

• Added missing space between --validator-config and
--preparation-mode flags in Windows validator provisioner commands

Old:

"${local.install_validator} --validator-config=${module.validator.instance_validator_config}--preparation-mode=true"

New:

"${local.install_validator} --validator-config=${module.validator.instance_validator_config} --preparation-mode=true",

License

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