onClick and onDblClick should return void, not {}

[AJIXuMuK]

Q	A
Bug fix?	[x]
New feature?	[ ]
New sample?	[ ]
Related issues?	no

What's in this Pull Request?

onClick and onDoubleClick properties were defined incorrectly in some field controls - the return type of these functions should be void instead of {}

[codecov-io]

Codecov Report

Merging #321 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #321   +/-   ##
=======================================
  Coverage   72.84%   72.84%           
=======================================
  Files          17       17           
  Lines         766      766           
  Branches      148      148           
=======================================
  Hits          558      558           
  Misses        161      161           
  Partials       47       47

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[estruyf]

Thanks @AJIXuMuK