SLAYER ALIF neuron's forward function uses wrong spike function signature

[bamsumit]

Objective of issue:

Lava DL version:

• 0.3.0 (feature release)
• 0.2.1 (bug fixes)
• 0.2.0 (current version)
• 0.1.2

Lava version:

• 0.4.0 (feature release)
• 0.3.1 (bug fixes)
• 0.3.0 (current version)
• 0.2.0
• 0.1.2

I'm submitting a ...

• bug report
• feature request
• documentation request

Current behavior:

• forward call to neuron has errors with wrong spike function signature

Expected behavior:

Steps to reproduce:

• Instantiate alif neuron and call it directly.

Related code:

insert short code snippets here

Other information:

File "/workspace/k8mirror/lava-dl/src/lava/lib/dl/slayer/neuron/alif.py", line 610, in forward
    return self.spike(voltage, threshold + refractory)
TypeError: spike() missing 1 required positional argument: 'refractory'