Fix slotOnload to use the correct on event name

[gabelew]

The event name returned is slotOnload, so the funcName generated in _onEvent in createManager.js is actually onSlotOnload and needs to be corrected.

[codecov]

Codecov Report

Merging #75 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #75   +/-   ##
=======================================
  Coverage   93.96%   93.96%           
=======================================
  Files           8        8           
  Lines         580      580           
=======================================
  Hits          545      545           
  Misses         35       35

Impacted Files	Coverage Δ
src/Bling.js	90.95% <ø> (ø)	⬆️

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[potench]

I don't think we have tests for any of these GPT pass-through events. Should consider introducing one here. Gonna accept this for now, but if you have a minute, can you PR a couple test cases to validate these pass-through events?

[potench]

looks good to me, but would be nice to have a test to validate this.