Revert "luci-base: force menu to regenerate after uci change"

Revert "luci-base: force menu to regenerate after uci change"

This reverts commit 97ebdcbddb9cad76dc551086fcb887e55886a069.

The commit seems to cause errors already before the login screen.
Discussion in https://github.com/openwrt/luci/commit/97ebdcbddb9cad76dc551086fcb887e55886a069#commitcomment-139871175

Errors like:

 In error(), file [C]
 called from function [anonymous function] (/usr/lib/lua/luci/ucodebridge.lua:23)
 called from function ((tail call))
 In [anonymous function](), file /usr/share/ucode/luci/runtime.uc, line 148, byte 45:
   called from function build_pagetree (/usr/share/ucode/luci/dispatcher.uc:382:73)
   called from function menu_json (/usr/share/ucode/luci/dispatcher.uc:439:26)
   called from function [anonymous function] (/usr/share/ucode/luci/dispatcher.uc:898:24)
   called from anonymous function (/www/cgi-bin/luci:39:13)

  `        return lcall.call(modname, method, ...args);`
   Near here ----------------------------------------^

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>