Fix error converting byte array to bytes32 when submitting task

[juztamau5]

The incentive layer uses bytes32 to represent the task data, I assume due to the difficulties of storing and returning a dynamic byte array (the code suggests using a content-addressed storage hash). When the task submitter creates a task, it needs to convert the task data from a byte array to the bytes32 expected by the incentive layer.

The solution is still wrong, but by applying #5, you can see that the task data is read back correctly:

Before:

{
  "solution": "0x00000000000000000000000000000000000000000000000000000000000001d5",
  "finalized": true,
  "data": [
    91,49,44,50,44,51,44,52,44,53,44,54,44,55,44,56,44,57,93
  ]
}

After:

{
  "solution": "0x0000000000000000000000000000000000000000000000000000000000000024",
  "finalized": true,
  "data": [
    1,2,3,4,5,6,7,8,9
  ]
}