do not explicitly enable ballooneval, otherwise it cannot be disabled

pag · pag · commit d7f6ff2fdf6c · 2013-06-11T23:21:44.000+01:00
diff --git a/ftplugin/python/ipy.vim b/ftplugin/python/ipy.vim
@@ -193,7 +193,6 @@ def km_from_string(s=''):
     vim.command("""
         if has('balloon_eval')
             set bexpr=IPythonBalloonExpr()
-            set ballooneval
         endif
         """)
     set_pid()
