add `else` branch to assign `u := ''` for non-`kIsRate` counters on console output

[Asfalan]

Currently any non-kIsRate counter that follows a kIsRate counter gets printed to the console with the lastly set unit, either u := 's' or u := '/s' because the following if statement has no else branch that assigns u := '' for non-kIsRate counters:

benchmark/Spring.Benchmark.pas

Lines 4306 to 4310 in 7c4b8d9

	if kIsRate in result.counters[i].counter.flags then
	if kInvert in result.counters[i].counter.flags then
	u := 's'
	else
	u := '/s';

Proposed fix: "added else branch to assign u := '' for non-kIsRate counters on console output"

    if kIsRate in result.counters[i].counter.flags then
      if kInvert in result.counters[i].counter.flags then
        u := 's'
      else
        u := '/s'
    else
      u := '';