Bugfix for attempt to perform arithmetic on field 'wxMOD_RAW_CONTROL'…

… (a nil value).

Fix for:
	Lua: Error while running chunk
	src/editor/editor.lua:664: attempt to perform arithmetic on field 'wxMOD_RAW_CONTROL' (a nil value)
	stack traceback:
		src/editor/editor.lua:664: in function <src/editor/editor.lua:649>
		[C]: in function 'MainLoop'
		src/main.lua:442: in main chunk
		[C]: ?

which happens with 0.361 using Linux. This behaviour could also be present using Windows though unverified.

src/editor/editor.lua

@@ -660,8 +660,8 @@ function CreateEditor()
         if event:ShiftDown() -- mark selection and scroll to caret
         then editor:SetCurrentPos(pos) editor:EnsureCaretVisible()
         else editor:GotoPos(pos) end
-      elseif mod == wx.wxMOD_RAW_CONTROL and keycode == wx.WXK_PAGEUP
-        or mod == (wx.wxMOD_RAW_CONTROL + wx.wxMOD_SHIFT) and keycode == wx.WXK_TAB then
+      elseif mod == wx.wxMOD_RAW_CONTROL and (keycode == wx.WXK_PAGEUP
+        or mod == (wx.wxMOD_RAW_CONTROL + wx.wxMOD_SHIFT) and keycode == wx.WXK_TAB) then
         if notebook:GetSelection() == first
         then notebook:SetSelection(last)
         else notebook:AdvanceSelection(false) end