EventLoaderTimepix3: change current time output log from INFO to DEBUG level.

Running on default settings, the output of EventLoaderTimepix3 has lines:

|12:57:47.645|    (INFO) [R:EventLoaderTimepix3:W0013_L09] Current time: 23.9066s

Which is a repetition of the information given by the generic progress line:

|12:57:47.648|  (STATUS) Ev: 18.3k Tr: 48.8k (2.67/ev) t = 23.9066s

I have changed this in log_level from INFO to DEBUG. Do you agree with this change @simonspa, @jekroege?