Enable space-in-parens rule

[limonte]

This rule is needed to prevent extra whitespaces in cases like this:

if (variable ) {
  //        ^
}

Noticed in vaadin/vaadin-upload#218 by @web-padawan

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[platosha]

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Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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[manolo]

Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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