applets/dict: Add main.xml

This file is missed, so no configuration will be saved.

applets/dict/package/contents/config/main.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<kcfg xmlns="http://www.kde.org/standards/kcfg/1.0"
+      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+      xsi:schemaLocation="http://www.kde.org/standards/kcfg/1.0
+      http://www.kde.org/standards/kcfg/1.0/kcfg.xsd" >
+  <kcfgfile name=""/>
+
+  <group name="General">
+    <entry name="dictionary" type="String">
+      <default>all</default>
+    </entry>
+  </group>
+</kcfg>