fix: Harden DBus security configuration

- Remove redundant allow own rule from default policy
- Keep allow own only in root policy for security
- Remove redundant interface-specific allow rules
- Simplify configuration while maintaining functionality

Log: Improve DBus security by ensuring only root can own the service

Author: itsXuSt

service/assets/data/com.deepin.diskmanager.conf

@@ -13,13 +13,6 @@
   <!-- Allow anyone to invoke methods on the interfaces -->
   <policy context="default">
     <allow send_destination="com.deepin.diskmanager"/>
-
-    <allow send_destination="com.deepin.diskmanager"
-           send_interface="com.deepin.diskmanager"/>
-    <allow send_destination="com.deepin.diskmanager"
-           send_interface="org.freedesktop.DBus.Properties"/>
-    <allow send_destination="com.deepin.diskmanager"
-           send_interface="org.freedesktop.DBus.Introspectable"/>
   </policy>
 
 </busconfig>