Update cl_luaview.lua

Resolves: 

[ERROR] addons/dbugr/lua/dbugr/gui/cl_luaview.lua:169: attempt to index a boolean value
  1. AppendText - addons/dbugr/lua/dbugr/gui/cl_luaview.lua:169
   2. oldFunc - addons/dbugr/lua/dbugr/gui/cl_pinpwindow.lua:58
    3. func - addons/dbugr/lua/dbugr/util/modules/sh_func.lua:77
     4. unknown - lua/includes/modules/net.lua:32

issue which comes up from time to time after clicking between a few of the files.