perf ui stdio: No need to use 'spaces' to left align

We can just use the 'field width' for the %s used to print the
alignment, this way we'll get the same result without requiring having a
variable with just lots of space chars.

No way to do that for the dots tho, we still need that variable filled
with dot chars.

  # perf report --stdio --hierarchy > before
  # perf report --stdio --hierarchy > after
  # diff before after
  #

I.e. it continues as:

  # perf report --stdio --hierarchy | head -15
  # To display the perf.data header info, please use --header/--header-only options.
  #
  #
  # Total Lost Samples: 0
  #
  # Samples: 107  of event 'cycles'
  # Event count (approx.): 31378313
  #
  #       Overhead  Command / Shared Object / Symbol
  # ..............  ............................................
  #
      80.13%        swapper
         72.29%        [kernel.vmlinux]
            49.85%        [k] intel_idle
             9.05%        [k] tick_nohz_next_event
  #

Cc: Adrian Hunter <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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