Passing TwoWire argument is kind of ignored (bug)

[Martin12350]

PCF8574(TwoWire &wire, int address) {
	this->address = address;
	this->wire = &wire;
	Wire.begin();
	Wire.setClock(PCF8574_CLOCK);
}

When passing TwoWire into constructor, static Wire is used regardless.
Meaning that if you use multiple Wires and expecting this library not to mess with Wire by passing argument,
it will not only work as expected, but cause you huge headache :D

Easy fix:

_wire->begin();
_wire->setClock(PCF8574_CLOCK);