Dialplan modify/add save default values instead of input values

[artkos]

If you use "Dialplan ID Mode: Pre-Defined values" in setting and try to modify or add new dialplan rule it will change "Dialplan ID" to default value.

My fix:
dialplan/template/dialplan.form.php
lines 55 - 56:

form_generate_select("Dialplan ID", "The dialplan ID of the rule",
	"dpid", "n", $dp_form['grp'],

change to:

form_generate_select("Dialplan ID", "The dialplan ID of the rule",
         "dpid", "n", $dp_form['dpid'],

Second field with problems is "Rule priority" if you edit dialplan rule where it is "0" it will clear field to "". It should remain "0".
My fix:
web/common/forms.php
at line 321 in function form_generate_input_text

if ($val!=null )
change to:
if ($val!=null || $val === 0 )

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