Fixed password field

Author: davidlb

plugin.py

@@ -10,7 +10,7 @@
         <param field="Address" label="MQTT Server address" width="300px" required="true" default="127.0.0.1"/>
         <param field="Port" label="Port" width="300px" required="true" default="1883"/>
         <param field="Username" label="MQTT Username" width="300px" required="false" default=""/>
-        <param field="Password" label="MQTT Password" width="300px" required="false" default=""/>
+        <param field="Password" label="MQTT Password" width="300px" required="false" default="" password="true"/>
         <param field="Mode1" label="Zigbee2Mqtt Topic" width="300px" required="true" default="zigbee2mqtt"/>
         <param field="Mode2" label="Zigbee pairing" width="75px" required="true">
             <options>