fix: enabled effect and drop unecessary refs

[DorianMaliszewski]

What I did

• Fix when enabled change it will run useEffect too handle the request (when disable by default and then enabling isIdle still true so no useEffect)
• Drop unsued ref to onSuccess and onError

[codecov]

Codecov Report

Merging #213 (a06b9ca) into master (ad5d479) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #213   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          275       273    -2     
  Branches        40        40           
=========================================
- Hits           275       273    -2     

Impacted Files	Coverage Δ
packages/use-dataloader/src/useDataLoader.js	100.00% <100.00%> (ø)

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