Config: Fix folder memory cards initial load

[stenzek]

Description of Changes

Fixed memory card folders being flagged as a non-present memory card if booting without opening the config dialog.

Also converted the type enum to a scoped enum, since I missed this in the other PR.

Rationale behind Changes

Regression from #4786.

Suggested Testing Steps

Make sure memory card folders load on a clean boot. I've checked it myself and they seem okay now.

Fixes #4862

[JordanTheToaster]

Tested working in Windows but another problem seems to have appeared where if you change either aspect ratio or FMV aspect ratio override they will return to default values after a clean boot.

[lightningterror]

Tested working in Windows but another problem seems to have appeared where if you change either aspect ratio or FMV aspect ratio override they will return to default values after a clean boot.

I informed Sten that aspect ratio, fmv aspect ratio, zoom (and maybe other stuff not yet discovered) don't work well on master, he'll look in to it tomorrow.

[JordanTheToaster]

Tested working in Windows but another problem seems to have appeared where if you change either aspect ratio or FMV aspect ratio override they will return to default values after a clean boot.

I informed Sten that aspect ratio, fmv aspect ratio, zoom (and maybe other stuff not yet discovered) don't work well on master, he'll look in to it tomorrow.

Got it this is just the first time I've seen it crop up like this.