pmcollectl: fix sub-second recording mode QA anomaly
pmcollectl: fix sub-second recording mode QA anomaly

A misunderstanding on my part on how the odd-looking +1sec
to all pmcollectl recordings was supposed to do something
useful, resulted in pmlogger popping up those pesky GUI-mode
record dialogs after pmcollectl recording.

Fix this in a way that will remove them for good while also
allowing short recording sessions to work.

edwardt/pcp,andyvand/cygpcpfans,edwardt/pcp,andyvand/cygpcpfans,tjanez/pcp,andyvand/cygpcpfans,prasincs/pcp,wuliming/pcp,tjanez/pcp,wuliming/pcp,tjanez/pcp,prasincs/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,tjanez/pcp,aeg-aeg/pcpfans,prasincs/pcp,edwardt/pcp,wuliming/pcp,edwardt/pcp,adfernandes/pcp,mbaldessari/pcp,adfernandes/pcp,mbaldessari/pcp,aeg-aeg/pcpfans,edwardt/pcp,adfernandes/pcp,prasincs/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,adfernandes/pcp,prasincs/pcp,andyvand/cygpcpfans,wuliming/pcp,prasincs/pcp,andyvand/cygpcpfans,adfernandes/pcp,andyvand/cygpcpfans,tjanez/pcp,prasincs/pcp,aeg-aeg/pcpfans,tjanez/pcp,andyvand/cygpcpfans,tjanez/pcp,edwardt/pcp,wuliming/pcp,aeg-aeg/pcpfans,edwardt/pcp,mbaldessari/pcp,edwardt/pcp,adfernandes/pcp,adfernandes/pcp,mbaldessari/pcp,aeg-aeg/pcpfans,wuliming/pcp,mbaldessari/pcp,tjanez/pcp,prasincs/pcp,mbaldessari/pcp