D24471: [KRDB] Remove Oxygen-era colour exporting code

[Carson Black]

cblack created this revision.
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REVISION SUMMARY
  GTK2 colours are no longer exported.
  This is necessary in 2019 because most popular GTK2 themes (including Breeze GTK) primarily use pixmaps 
  which cannot respect these colours. This results in odd-looking mixtures of some widgets following the
  colourscheme and some not.

TEST PLAN
  See that GTK2 colours are no longer exported and that GTK2 themes with a mixture of pixmaps/not pixmaps
  don't display colour inconsistencies.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  krdb-remove-oxygen-era-code (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D24471

AFFECTED FILES
  kcms/krdb/krdb.cpp

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