Possible copypast issue

[mitallast]

I found possible copypast issue in CIA::process_irq(&mut self) function (see link below).
Perhaps timer B is needed to check after timer A?

rust64/src/c64/cia.rs

Lines 479 to 504 in 3e9d295

	pub fn process_irq(&mut self) {
	if self.timer_a.irq_next_cycle {
	if self.trigger_irq(1) {
	if self.is_cia1 {
	as_mut!(self.cpu_ref).set_cia_irq(true);
	}
	else {
	as_mut!(self.cpu_ref).set_nmi(true);
	}
	}
	self.timer_a.irq_next_cycle = false
	}
	if self.timer_a.irq_next_cycle {
	if self.trigger_irq(2) {
	if self.is_cia1 {
	as_mut!(self.cpu_ref).set_cia_irq(true);
	}
	else {
	as_mut!(self.cpu_ref).set_nmi(true);
	}
	}
	self.timer_a.irq_next_cycle = false
	}
	}