cleanup: Use deepUnpack() intead of deep_unpack()

deep_unpack() is just a backwards compability alias for deepUnpack()[1].
The new name makes it more clear that this is not a C function, start to
use it.

[1] 13e662a29d

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2416>

js/ui/status/rfkill.js

@@ -63,7 +63,7 @@ const RfkillManager = GObject.registerClass({
     /* eslint-enable camelcase */
 
     _changed(proxy, properties) {
-        for (const prop in properties.deep_unpack()) {
+        for (const prop in properties.deepUnpack()) {
             switch (prop) {
             case 'AirplaneMode':
                 this.notify('airplane-mode');