fix(core-forger): use correct IV length for encryption

[faustbrian]

Summary

Commit digitalbazaar/forge@9979169 in node-forge introduced a new error that is thrown when the IV length isn't matching what would be expected digitalbazaar/forge@9979169#diff-e118e6ad049019e947a73be26a7d966cR972-R976

Previously this just worked even though the IV length was invalid but now node-forge throws an exception like below. Relies on #3025 to pass tests.

Error: Invalid IV length; got 6 bytes and expected 16 bytes.
    at transformIV (/Users/dev/Code/core/node_modules/node-forge/lib/cipherModes.js:973:11)
    at Object.<anonymous>.modes.cbc.start (/Users/dev/Code/core/node_modules/node-forge/lib/cipherModes.js:122:16)
    at Object.<anonymous>.forge.cipher.BlockCipher.Object.<anonymous>.BlockCipher.start (/Users/dev/Code/core/node_modules/node-forge/lib/cipher.js:158:13)
    at Delegate.encryptDataWithOtp (/Users/dev/Code/core/packages/core-forger/src/delegate.ts:137:16)
    at Delegate.encryptKeysWithOtp (/Users/dev/Code/core/packages/core-forger/src/delegate.ts:68:35)
    at new Delegate (/Users/dev/Code/core/packages/core-forger/src/delegate.ts:49:22)
    at Object.<anonymous> (/Users/dev/Code/core/__tests__/unit/core-forger/delegate.test.ts:28:34)
    at Object.asyncJestTest (/Users/dev/Code/core/node_modules/jest-jasmine2/build/jasmineAsyncInstall.js:102:37)
    at /Users/dev/Code/core/node_modules/jest-jasmine2/build/queueRunner.js:43:12
    at new Promise (<anonymous>)

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #3036 into develop will increase coverage by 36.11%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           develop    #3036       +/-   ##
============================================
+ Coverage    29.52%   65.64%   +36.11%     
============================================
  Files          425      425               
  Lines        11733    11732        -1     
  Branches      1595     1595               
============================================
+ Hits          3464     7701     +4237     
+ Misses        8237     3995     -4242     
- Partials        32       36        +4

Impacted Files	Coverage Δ
packages/core-forger/src/delegate.ts	100% <100%> (+60.65%)	⬆️
packages/crypto/src/utils/base58.ts	100% <0%> (+7.14%)	⬆️
...ckages/core-transaction-pool/src/wallet-manager.ts	100% <0%> (+7.14%)	⬆️
...ckages/core-transactions/src/transaction-reader.ts	8.33% <0%> (+8.33%)	⬆️
packages/crypto/src/transactions/types/factory.ts	100% <0%> (+8.33%)	⬆️
packages/core-container/src/config/file-loader.ts	10.86% <0%> (+10.86%)	⬆️
packages/core-transaction-pool/src/manager.ts	100% <0%> (+11.11%)	⬆️
...ckages/core-p2p/src/socket-server/versions/peer.ts	60% <0%> (+12.72%)	⬆️
packages/core-utils/src/httpie.ts	12.9% <0%> (+12.9%)	⬆️
packages/core-p2p/src/utils/is-valid-version.ts	100% <0%> (+14.28%)	⬆️
... and 191 more

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