Output for NIR conversion of CuBa LIF neurons incorrect

[Jegp]

• snntorch version: N/A
• Python version: N/A
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Description

@DylanMuir found a problem where CuBaLIF neurons would have an input_type of [] instead of [1] when exporting to NIR (neuromorphs/NIR#107). There is a PR pending in the NIR codebase, but it would be good to adhere to the convention that all neuron types are array-valued instead of scalar-valued to avoid erroneous parsing and misconfiguration.