ChemicalReactions: fix a bug causing incorrect bonds exchange

[#56880370]
ChemicalRactions: add a new interactive presenting water reaction

[#56872046]

It replaces old "Simplest Hydrogen-Oxygen Reaction" which wasn't
working even in Classic MW, so wasn't useful at all.
Rename "Simplest Hydrogen-Oxygen Reaction" models and interactive

[#56872046]

as in fact it isn't the simples possible reaction. It's a medium
complexity model, quite good for testing though.