-Werror,-Wunused-private-field

...since 9eb81304 "tdf#120703 PVS: drop the
unused code".  And which now removes the sole use of RID_SVXSTR_LOAD_ERROR.

Change-Id: If8afa7595a449cb8677b03a159a452b73fed110e

cui/inc/strings.hrc

@@ -362,7 +362,6 @@
 #define RID_SVXSTR_DEL_SPACES_BETWEEN_LINES         NC_("RID_SVXSTR_DEL_SPACES_BETWEEN_LINES", "Delete spaces and tabs at end and start of line")
 #define RID_SVXSTR_CONNECTOR                        NC_("RID_SVXSTR_CONNECTOR", "Connector")
 #define RID_SVXSTR_DIMENSION_LINE                   NC_("RID_SVXSTR_DIMENSION_LINE", "Dimension line")
-#define RID_SVXSTR_LOAD_ERROR                       NC_("RID_SVXSTR_LOAD_ERROR", "The selected module could not be loaded.")
 #define RID_SVXSTR_STARTQUOTE                       NC_("RID_SVXSTR_STARTQUOTE", "Start Quote")
 #define RID_SVXSTR_ENDQUOTE                         NC_("RID_SVXSTR_ENDQUOTE", "End Quote")
 

cui/source/inc/treeopt.hxx

@@ -133,7 +133,6 @@ private:
     SvTreeListEntry*       pCurrentPageEntry;
 
     OUString               sTitle;
-    OUString               sNotLoadedError;
 
     bool                   bForgetSelection;
     bool                   bIsFromExtensionManager;

cui/source/options/treeopt.cxx

@@ -482,7 +482,6 @@ struct OptionsGroupInfo
     m_pParent           ( pParent ),\
     pCurrentPageEntry   ( nullptr ),\
     sTitle              ( GetText() ),\
-    sNotLoadedError     (       CuiResId( RID_SVXSTR_LOAD_ERROR ) ),\
     bForgetSelection    ( false ),\
     bIsFromExtensionManager( false ), \
     bIsForSetDocumentLanguage( false ), \