Remove trasition fail when state is Enum

[hookokoko]

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Describe the bug #162 In this issue, add a feature to remove transitions.

It will remove trasition fail when the source/target is of Enum type, because Enum('source') is not equal to 'source'. This could be confusing otherwise.

I think this situation also needs to be considered.

target_source = source.name if hasattr(source, 'name') else source if source != "*" else ""
target_dest = dest.name if hasattr(dest, 'name') else dest if dest != "*" else ""