fix: keyboard applet doesn't autoload on Wayland

To make it autoload, it must be enabled by default.
It won't be autoloaded on X11 still, because there is no
org.kde.keyboard.wayland DBus service.


(cherry picked from commit f7e1f1e8)

applets/keyboardlayout/metadata.desktop

@@ -110,7 +110,7 @@ X-KDE-PluginInfo-Name=org.kde.plasma.keyboardlayout
 X-KDE-PluginInfo-Version=1.0
 X-KDE-PluginInfo-Website=https://kde.org/plasma-desktop/
 X-KDE-PluginInfo-License=GPL-2.0+
-X-KDE-PluginInfo-EnabledByDefault=false
+X-KDE-PluginInfo-EnabledByDefault=true
 X-Plasma-DBusActivationService=org.kde.keyboard.wayland
 
 X-Plasma-NotificationArea=true