[pvr] change misleading log message

We're playing a recording, the old message made it sound like we're 
beginning to record something
[pvr] remove superfluous and and non-working log message

tag.m_strFile is always empty here anyway, and the only place where this 
method is called from already logs the event properly
[pvr] correct class name used in log message
Merge pull request #4400 from Jalle19/fix-log-messages

Fix some erroneous log messages