Fix Sparkling Aria's interaction with Shield Dust

[andrebastosdias]

Closes #10293
I don't know if there's already a way to determine how many targets were hit. spreadHit doesn't take into account protections, misses, etc.

[andrebastosdias]

I have another version of the code that doesn't change Sparkling Aria and instead makes use of dustproof, modifying Shield Dust and Covert Cloak:

onModifySecondaries(secondaries, target, source, move) {
	this.debug('Shield Dust prevent secondary');
	const targets = this.getAllActive().filter(p => p.getMoveHitData(move).successful).length;
	return secondaries.filter(effect => !!(effect.self || (effect.dustproof && targets > 1)));
},

The question is whether you think it's worth keeping the dustproof flag. Let me know which one you prefer!

[pyuk-bot]

A relatively less intrusive but more hacky solution could be to give the move two secondaries that both apply the condition and make one of them dustproof. We could use onRestart to detect if the condition is applied twice to the same mon, and if it has been, run the function to cure burns on all afflicted targets.

[andrebastosdias]

I think this is the best option. I actually find it pretty weird that we don't track which Pokémon were hit by a move. Once implemented, it's not intrusive at all.