D12034: Use the more appropriate "two sliders" icon for "configure"

[Nathaniel Graham]

ngraham added a reviewer: Breeze.

REPOSITORY
  R266 Breeze Icons

REVISION DETAIL
  https://phabricator.kde.org/D12034

To: ngraham, #vdg, #plasma, #breeze
Cc: sharvey, #frameworks, michaelh, ngraham, bruns