Remove the volume button shortcuts as these are built into LXQt.

debian/changelog

@@ -3,6 +3,7 @@ lubuntu-default-settings (1.4) UNRELEASED; urgency=medium
   * Remove /usr/share/applications; these files are native in LXQt.
   * Don't launch a file manager on Ctrl + Alt + D, because that already
     shows the desktop in LXQt.
+  * Remove the volume button shortcuts as these are built into LXQt.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Fri, 20 Jul 2018 01:28:38 -0500
 

src/etc/xdg/xdg-Lubuntu/openbox/lxqt-rc.xml

@@ -427,23 +427,6 @@
     </action>
   </keybind>
 -->
-  
-  <!-- Keybinding for Volume management -->
-  <keybind key="XF86AudioRaiseVolume">
-      <action name="Execute">
-          <command>amixer -q sset Master 3%+ unmute</command>
-      </action>
-  </keybind>
-  <keybind key="XF86AudioLowerVolume">
-      <action name="Execute">
-          <command>amixer -q sset Master 3%- unmute</command>
-      </action>
-  </keybind>
-  <keybind key="XF86AudioMute">
-      <action name="Execute">
-          <command>amixer -q sset Master toggle</command>
-      </action>
-  </keybind>
 
   <!-- Keybinding for terminal button-->
   <keybind key="XF86WWW">