remove code duplication in analyserkey

We can just call 'loadStored' in the initialise to check if we need to
reanalyze a track. This is the same thing we do in the analyserqueue
remove duplicate code for analyserbeats

We can just use 'loadStored' in the initialise function to check if we
need to reanalyze a track. This is the same logic that we use in the
analyserqueue.
Merge pull request #343 from kain88-de/reduce_code_duplication

Reduce code duplication