[gui] Fix TList construction in TGTable

The `TList::TList(TObject*)` ctor is marked as dont use for more than two
decades.

It looks like the intent of the code was to somehow initialize the
content of the created lists, which no longer works as the passed
argument is just discarded.

Author: dennisklein

gui/gui/src/TGTable.cxx

@@ -162,11 +162,11 @@ TGTable::TGTable(const TGWindow *p, Int_t id, TVirtualTableInterface *interface,
    fCurrentRange = new TTableRange();
    fDataRange = new TTableRange();
    fGotoRange = new TTableRange();
-   TGLayoutHints *hints = 0;
-   fCellHintsList = new TList(hints);
-   fRHdrHintsList = new TList(hints);
-   fCHdrHintsList = new TList(hints);
-   fMainHintsList = new TList(hints);
+
+   fCellHintsList = new TList();
+   fRHdrHintsList = new TList();
+   fCHdrHintsList = new TList();
+   fMainHintsList = new TList();
 
    // To be done: GetBackground colors for .rootrc
    SetBackgroundColor(GetWhitePixel());