Qt: Pad time values for loading times

Pad the loading time values with leading zeros each
Fixes: #17601
2 jobs for master in 18 minutes and 51 seconds (queued for 41 seconds)
Status Name Job ID Coverage
  Analysis
passed Coverity Visual C++ Scan #1604930200
wireshark-windows-merge-req

00:17:46

 
  .Post
passed Coverity Visual C++ Submit #1604930209

00:01:05