fix Dynamic Arrays encode

[gtebrean]

What does this PR do?

Fixes #1949

Where should the reviewer start?

required

Why is it needed?

Case wasn't covered until now and we found out is not working properly.

[cfelde]

LGTM, but should be also ensure we can decode this, i.e., any changes needed to TypeDecoder for example?

[codecov]

Codecov Report

Merging #1961 (a426d7d) into master (e4e1dd7) will increase coverage by 0.07%.
The diff coverage is 82.60%.

@@             Coverage Diff              @@
##             master    #1961      +/-   ##
============================================
+ Coverage     68.38%   68.46%   +0.07%     
- Complexity     2993     3001       +8     
============================================
  Files           488      488              
  Lines         12510    12550      +40     
  Branches       1631     1636       +5     
============================================
+ Hits           8555     8592      +37     
- Misses         3481     3482       +1     
- Partials        474      476       +2     

Files Changed	Coverage Δ
abi/src/main/java/org/web3j/abi/TypeDecoder.java	75.49% <78.12%> (+0.65%)	⬆️
abi/src/main/java/org/web3j/abi/TypeEncoder.java	94.58% <80.00%> (-0.45%)	⬇️
abi/src/main/java/org/web3j/abi/Utils.java	80.53% <100.00%> (+1.25%)	⬆️

... and 2 files with indirect coverage changes

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[NickSneo]

LGTM

[cfelde]

LGTM