'Back' button works in SX Since-Last-Run dialog

[Josh Sled]

I've fixed bug http://bugzilla.gnome.org/show_bug.cgi?id=84688, so the
'Back' button works in the Since-Last-Run dialog, now.  Please let me know
if you encounter any problems with it.  You should be able to go all the
way to the end, then back up all the way to the beginning, and make changes
along the way that are reflected in the appropriate subsequent pages.

... with the exception of Bugs 89924 and 89925 ...

In any case, let me know what you think or if you run into any problems.

...jsled

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