Revert "Related tdf#105500: leaks in PaletteManager and SvxColorToolBoxControl"

This reverts commit 8c0cc5cd.

These changes are unnecessary, the compiler already automatically
generates the necessary code.

svx/source/tbxctrls/PaletteManager.cxx

@@ -62,7 +62,6 @@ PaletteManager::PaletteManager() :
 
 PaletteManager::~PaletteManager()
 {
-    m_Palettes.clear();
 }
 
 void PaletteManager::LoadPalettes()

svx/source/tbxctrls/tbcontrl.cxx

@@ -2807,7 +2807,6 @@ void SvxColorToolBoxControl::EnsurePaletteManager()
 
 SvxColorToolBoxControl::~SvxColorToolBoxControl()
 {
-    m_xPaletteManager.reset(nullptr);
 }
 
 void SvxColorToolBoxControl::setColorSelectFunction(const ColorSelectFunction& aColorSelectFunction)