Possible fix for "ignore user" not working in inbox view

Hello,

This is an attempted fix for the issue raised here: https://github.com/honestbleeps/Reddit-Enhancement-Suite/issues/671

I've added a check for pageType inbox, and altered the code used to get the thisPost variable (basically more parentNodes). Additionally I've also added an extra bit of logic to the "soft" ignore, to remove message titles as well as the message itself.

Unsure if there may be a cleaner way to do this for the soft ignore (could potentially used jQuerys .parents(".something"), although i imagine that would be a little slower performance wise)

Thanks,
Carl