Remove comments embedded in switch construct in popupConfigApply in

Remove comments embedded in switch construct in popupConfigApply in
an attempt to unbreak it -> man n switch says comments may not be
embedded in between switch tokens / sections, it seems that my copy
of tclsh8.4 becomes really nervous about that (the older versions
did not complain as far as I can recall).

While here, do some indentation cleanups.

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