wrap DecryptContentKey in try/catch to prevent erroring out

[InvoxiPlayGames]

Sometimes on My Machine unsealing certain content instance keys fails, a complete guess is this is as a result of uninstalling or losing access to a license (GP expiry maybe?). This previously prevented the entire process from working. This PR allows it to complete dumping keys, only skipping over ones that fail to decrypt.

Previous output:

INFO: Loading entries from registry...
INFO: Registry loaded.
INFO: Reading device key from snip\deviceKey.txt.
INFO: Successfully loaded device key from file.
Error: checksum failed

New output:

INFO: Loading entries from registry...
INFO: Registry loaded.
INFO: Reading device key from snip\deviceKey.txt.
INFO: Successfully loaded device key from file.
??
├── ?? app1
│   ├── License Type: App
│   └── ?? key1
│       └── Key: snip
├── ?? app2
│   ├── License Type: App
│   └── ?? key2
│       └── Error: checksum failed
├── ?? app3
│   ├── License Type: App
│   └── ?? key3
│       └── Key: snip

[LukeFZ]

forgot to merge this, sorry