Fix burst mode not disabled when generating non-burst signals

[raywcm]

Problem

When generating a burst signal on an AFG followed by a non-burst signal via generate_function, the burst state is not reset. The non-burst signal remains affected by the previous burst settings, producing incorrect output.

Fix

Add an else branch to set_function_properties to disable burst state when burst_count is 0.

Closes #440

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[raywcm]

I have read the CLA Document and I hereby sign the CLA

[v12ganesh]

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[nfelt14]

Closing this PR based on a lack of interaction and updates.