remove unused GraphicsStateUpdateFlags enum values

Change-Id: I1a83c897d93a29d38aebccdba33be7b70592922e
Reviewed-on: https://gerrit.libreoffice.org/64096
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

compilerplugins/clang/unusedenumconstants.writeonly.results

@@ -10654,10 +10654,6 @@ vcl/source/fontsubset/ttcr.hxx:53
     enum vcl::TTCRErrCodes TTCR_NAMETOOLONG
 vcl/source/fontsubset/ttcr.hxx:54
     enum vcl::TTCRErrCodes TTCR_POSTFORMAT
-vcl/source/gdi/pdfwriter_impl.hxx:75
-    enum GraphicsStateUpdateFlags TextLineColor
-vcl/source/gdi/pdfwriter_impl.hxx:76
-    enum GraphicsStateUpdateFlags OverlineColor
 vcl/source/gdi/pdfwriter_impl.hxx:81
     enum GraphicsStateUpdateFlags All
 vcl/source/gdi/pdfwriter_impl.hxx:795

vcl/source/gdi/pdfwriter_impl.hxx

@@ -73,8 +73,6 @@ enum class GraphicsStateUpdateFlags {
     MapMode               = 0x0002,
     LineColor             = 0x0004,
     FillColor             = 0x0008,
-    TextLineColor         = 0x0010,
-    OverlineColor         = 0x0020,
     ClipRegion            = 0x0040,
     LayoutMode            = 0x0100,
     TransparentPercent    = 0x0200,
@@ -1080,25 +1078,21 @@ public:
     void setTextLineColor()
     {
         m_aGraphicsStack.front().m_aTextLineColor = COL_TRANSPARENT;
-        m_aGraphicsStack.front().m_nUpdateFlags |= GraphicsStateUpdateFlags::TextLineColor;
     }
 
     void setTextLineColor( const Color& rColor )
     {
         m_aGraphicsStack.front().m_aTextLineColor = rColor;
-        m_aGraphicsStack.front().m_nUpdateFlags |= GraphicsStateUpdateFlags::TextLineColor;
     }
 
     void setOverlineColor()
     {
         m_aGraphicsStack.front().m_aOverlineColor = COL_TRANSPARENT;
-        m_aGraphicsStack.front().m_nUpdateFlags |= GraphicsStateUpdateFlags::OverlineColor;
     }
 
     void setOverlineColor( const Color& rColor )
     {
         m_aGraphicsStack.front().m_aOverlineColor = rColor;
-        m_aGraphicsStack.front().m_nUpdateFlags |= GraphicsStateUpdateFlags::OverlineColor;
     }
 
     void setTextFillColor( const Color& rColor )