Update spacing for flags within Help text

[nywilken]

Before Change

Options:
  - path <path>: install the plugin from a locally-sourced plugin binary. This
                 installs the plugin where a normal invocation would, but will
                 not try to download it from a remote location, and instead
                 install the binary in the Packer plugins path.
                 This option cannot be specified with a version constraint.
  - force:       forces reinstallation of plugins, even if already installed.

After Change

Options:
  -path <path>                  Install the plugin from a locally-sourced plugin binary.
                                This installs the plugin where a normal invocation would, but will
                                not try to download it from a remote location, and instead
                                install the binary in the Packer plugins path. This option cannot
                                be specified with a version constraint.
  -force                        Forces reinstallation of plugins, even if already installed.

[lbajolet-hashicorp]

LGTM!

[github-actions]

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