* In v1.15 if you upgraded from a previous version and had a renderdoc config
file then the persistent storage storing the filters would get loaded with an
empty variant map, so the defaults could be set. However if you had no config
file at all this wouldn't happen so no defaults would be set.
* We detect the case where we load an old profile and it has blank current
filter or saved filters, and fill in the defaults now. If the filter has been
customised or some saved filters exist, respectively, we don't touch them.
baldurk
f8cf943c42