Debugger: Also execute exit statement of function

[bneukom]

Originally reported by: bneukom (Bitbucket: bneukom, GitHub: bneukom)

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If we exit too early (as we do now) the last item on the dstack might not be shown.

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• Bitbucket: https://bitbucket.org/bneukom/ch.fhnw.mdt/issue/31

[bneukom]

Original comment by bneukom (Bitbucket: bneukom, GitHub: bneukom):

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Exit statements are now being executed and the stack at the end is shown.