trace-cmd listen: Replace tab with spaces in help output The bash completions of trace-cmd commands uses the -h to find the options to finish the completions with. trace-cmd listen -h had a tab before "-l" which caused the completions to miss it. Not to mention, it caused -l not to be in line with the other options. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>