D26845: [context menu] Remove last traces of "Lock Widgets" action from UI

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: mart, Plasma.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  In Plasma, 5.18, this ishn't a user-facing option anymore. It's still visible in the
  context meny configuration dialog though, and it's still referenced in some of the
  context menu building code.
  
  This patch removes it from those places
  
  BUG: 416578
  FIXED-IN: 5.18.0

TEST PLAN
  Context menu still looks the same on the desktop and panel, both in and out of edit mode
  The action no longer shows up in the configuration UI.
  
  Please review carefully as this code is fairly unfamiliar to me.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  remove-last-traces-of-lock-widgets-action (branched from Plasma/5.18)

REVISION DETAIL
  https://phabricator.kde.org/D26845

AFFECTED FILES
  containmentactions/contextmenu/menu.cpp

To: ngraham, mart, #plasma
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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