Use only wxFont ctor from wxFontInfo in the samples

Follow the documentation advice and prefer to use the ctor taking
wxFontInfo as it makes the code slightly shorter and more readable.

samples/caret/caret.cpp

@@ -337,8 +337,7 @@ void MyCanvas::CreateCaret()
 
 void MyCanvas::SetFontSize(int fontSize)
 {
-    m_font = wxFont(fontSize, wxFONTFAMILY_TELETYPE,
-                    wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
+    m_font = wxFont(wxFontInfo(fontSize).Family(wxFONTFAMILY_TELETYPE));
 
     wxClientDC dc(this);
     dc.SetFont(m_font);