update Usine 5.50.48 poly

[senso]

[large]Usine / Easine 5.50.48[/large]

This version must replace the 5.50.47. Several important bugs solved.

fixed bugs
- [remote] the midimode combobox value is not properly strored (ie: in the global synchro)
- [grain sampler] the speed parameter doesn't appear in the module