Fixed ChromeTabs not rendering properly in wx 3.0

Signed-off-by: Gleb Golubitsky <sectoid@gnolltech.org>

gui/chromeTabs.py

@@ -669,6 +669,8 @@ class PFTabsContainer(wx.Panel):
         """
 
         wx.Panel.__init__(self, parent, id, pos, size)
+        if wx.VERSION >= (3,0):
+            self.SetBackgroundStyle(wx.BG_STYLE_PAINT)
 
         self.tabs = []
         width, height = size