Fix non-interactive compilation

[rcloran]

.znap.compile checks the funcstack, with the intent of determining whether or not to output user visible messages -- they should only be output when called directly from the znap CLI tool.

Unfortunately, this check was written in a way that means that when called from outside of the main znap function (eg, compdump background compilation, auto-compile), no compilation happened.

This change re-orders the checks so that .znap.compile works when called from other parts of znap, like compdump compilation.

Fixes #267

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[rcloran]

Seems that this also fixes auto-compile... but that's the only other caller of .znap.compile that I've checked.

[marlonrichert]

Thanks!