kcms/colors: remove dead code

We go through a bunch of effort to set m_applyToAlien, but then never
use it anywhere. It must not be very important here.

kcms/colors/colors.cpp

@@ -329,13 +329,6 @@ void KCMColors::load()
 
     loadSelectedColorScheme();
 
-    {
-        KConfig cfg(QStringLiteral("kcmdisplayrc"), KConfig::NoGlobals);
-        KConfigGroup group(m_config, "General");
-        group = KConfigGroup(&cfg, "X11");
-        m_applyToAlien = group.readEntry("exportKDEColors", true);
-    }
-
     // If need save is true at the end of load() function, it will stay disabled forever.
     // setSelectedScheme() call due to unexisting scheme name in kdeglobals will trigger a need to save.
     // this following call ensure the apply button will work properly.

kcms/colors/colors.h

@@ -101,8 +101,6 @@ private:
     bool m_selectedSchemeDirty = false;
     bool m_activeSchemeEdited = false;
 
-    bool m_applyToAlien = true;
-
     QProcess *m_editDialogProcess = nullptr;
 
     KSharedConfigPtr m_config;