tools/cgset: Fix -R switch indentation in help menu

tools/cgset: Fix -R switch indentation in help menu

Fix the indentation of '-R' switch description of cgset help menu.

Before:
-------
$ cgset --help
Usage: cgset [-r <name=value>] <cgroup_path> ...
   or: cgset --copy-from <source_cgroup_path> <cgroup_path> ...
Set the parameters of given cgroup(s)
  -r, --variable <name>                 Define parameter to set
  --copy-from <source_cgroup_path>      Control group whose parameters will be copied
  -b                                    Ignore default systemd delegate hierarchy
  -R                                      Recursively set variable(s) for cgroups under <cgroup_path>

After:
------
$ cgset --help
Usage: cgset [-r <name=value>] <cgroup_path> ...
   or: cgset --copy-from <source_cgroup_path> <cgroup_path> ...
Set the parameters of given cgroup(s)
  -r, --variable <name>                 Define parameter to set
  --copy-from <source_cgroup_path>      Control group whose parameters will be copied
  -b                                    Ignore default systemd delegate hierarchy
  -R                                    Recursively set variable(s) for cgroups under <cgroup_path>

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>