cancel fix: do not force reload

when the user navigate between the element details tabs of opened reactions and samples:

- fix synchronization of density/molarity
- fix synch e.g when navigating to one Reaction, to a non associated sample, then to an associated sample.
  the data are synchronized independently of next tab:
  -- when the previous tab was a reaction then the data in all opened associated samples tabs will be synchronized
  -- when the previous tab was a sample then the data in the opened reaction tab will be synchronized (w reaction.updateMaterial)

simplify synchronize element