Deprecate second parameter of wxSlider::SetTickFreq().

This parameter was never needed nor properly documented. Simply remove it from
SetTickFreq() and keep the overload still taking it for backwards
compatibility only.

Closes #12907.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66844 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/controls/controls.cpp

@@ -855,7 +855,7 @@ MyPanel::MyPanel( wxFrame *frame, int x, int y, int w, int h )
     m_slider = new wxSlider( panel, ID_SLIDER, 0, 0, 200,
                              wxDefaultPosition, wxSize(155,wxDefaultCoord),
                              wxSL_AUTOTICKS | wxSL_LABELS);
-    m_slider->SetTickFreq(40, 0);
+    m_slider->SetTickFreq(40);
     sz->Add( m_slider, 0, wxALL, 10 );
 
     m_gaugeVert = new wxGauge( panel, wxID_ANY, 100,

samples/widgets/slider.cpp

@@ -531,7 +531,7 @@ void SliderWidgetsPage::DoSetTickFreq()
         return;
     }
 
-    m_slider->SetTickFreq(freq, 0 /* unused */);
+    m_slider->SetTickFreq(freq);
 }
 
 void SliderWidgetsPage::DoSetThumbLen()