Accomodate new rucio output style in SampleHandler

It appears that the new default rucio version 1.23.5 produces its summary output in a slightly modified style where there are no blank spaces before the colons. I assume that backwards compatibility with older rucio versions is not necessary here, otherwise it would be easy to achieve this e.g. by just removing the last part of the relevant search patterns, but I assume the patterns have been made as specific as possible to avoid accidental matches.