D27950: Assign an icon to action submenus

[Aleix Pol Gonzalez]

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REVISION SUMMARY
  Currently, action submenus (X-KDE-Submenu) have no icons.
  This patch makes it inherit the icon of the first action.
  There will always be at least one action, since empty submenus are
  eliminated earlier in the function.
  If the icon of the first action is empty, it will gracefully revert to
  old behavior (not having an icon).
  
  Patch by Chloe Kudryavtsev <toast at toast.cafe>

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D27950

AFFECTED FILES
  src/widgets/kfileitemactions.cpp

To: apol, #frameworks
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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