Add option for Configuration Via Keypad Menu.

[piajesse]

Current variable

Need a name for the variable @danry25.

[piajesse]

grandstream_configuration_via_keypad

[piajesse]

@danry25 fixed this, but I would recommend setting the default in the app settings or testing if the varible is blank, and then set it to something. Check How I did it with DND
https://github.com/piajesse/fusionpbx/commit/996087982d106af2df890b6bf49779dbf238d7c0

[piajesse]

Also added default_settings with adbdde9

[piajesse]

@danry25 all you for submitting the PR