Make it possible to create just one clock, for testing

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42886 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/demo/AnalogClock.py

@@ -15,7 +15,10 @@ class TestPanel(wx.Panel):
         wx.Panel.__init__(self, parent)
 
         # A mostly default clock
-        c1 = ac.AnalogClock(self)
+        c1 = ac.AnalogClock(self, size=(200,200))
+
+        if True: # for a simpler test case just set this to False and
+                 # only the one clock will be created
             
             # A plain clock, with square hour and round minute marks, no
             # shadow, static border