[Bug] Custom Encryption Crashes if no Secure Storage

[georgeflug]

Describe the bug
Loading an existing storage instance using a custom encryption key causes the app to crash if secure storage is not used.

To Reproduce
Use the following code:

const myStorage = new MMKVLoader()
        .withInstanceID('myInstanceId')
        .withEncryption()
        .encryptWithCustomKey(`myEncryptionKey`, false)
        .initialize();

Expected behavior
The storage is initialized the first time it is run. However, if you restart the app and initialize the storage again, the app exits immediately. I expect the storage to load without crashing.

Platform Information:

• OS: Android (did not try iOS)
• React Native Version: 0.67.3
• Library Version: 0.7.6

Additional context
I did some troubleshooting and found that this line of code in initializer.js is the last line that runs before the crash: var key = mmkvJsiModule.getSecureKey(options.alias); (inside initWithEncryptionUsingOldKey). It seems it's trying to load the key from secure storage even though the secure storage boolean was set to false.