Changed settings.xml mqtthost type from ipaddress to text

The mqtthost setting type was still set to ipaddress. It looked like
support for hostname had been added so I changed it to text and it works
great.

service.mqtt/resources/settings.xml

 <?xml version="1.0" encoding="utf-8" standalone="yes"?>
 <settings>
     <category label="30001">
-        <setting label="30011" type="ipaddress"   id="mqtthost" default="127.0.0.1"/>
+        <setting label="30011" type="text"   id="mqtthost" default="127.0.0.1"/>
         <setting label="30012" type="number"   id="mqttport" default="1883"/>
         <setting label="30013" type="text" id="mqtttopic" default="kodi/"/>
     </category>