Clear filter key in corset inspect

[OlivierBBB]

Main point

The filter / clear filter keys are f / F.

This leads to many involuntary clear filter calls. Indeed most of the column names are in ALL CAPS, so when writing or amending the filter I use caps lock. I've rarely ever wanted to clear the filter. But I've likely cleared the filter by accident upwards of 50 times or so. Which leads to many times rewriting the same stuff à la stack/INSTR PEEK_ CONTEXT.*REV acc.*SIZE\> etc ...

Proposal

It would be much more natural to use a key with little to no use to clear the filter, in particular not a capitalized letter from the alphabet. For instance # or ~ could make sense.