fix cfOrVm prompt

[Sladuca]

Description

Expected behavior:
When setting up a ceremony for a circuit with >1M constraints, the CLI automatically chooses VM verification and promps the user to select and instance type.

Actual behavior:
When setting up a ceremony for a circuit with >1M constraints, the CLI automatically chooses CF verification

The reason this occurs was because we assume cfOrVM is a boolean when it's actually a string in the case that enforceVm is true. Since the string is truthy, the CLI sets it to CF verification instead of VM verification.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• I reviewed the code of conduct and contributors' guide

[Sladuca]

@ctrlc03 I believe this fixes #191

[ctrlc03]

Great catch!!