Make sure to query dbus as the right user

This was funny: shell-command-to-string runs on the buffer current
directory; if we were visiting a file with tramp (e.g. as root), then
qdbus would be invoked as root, resulting in kactivitymanager being
spawned as root, resulting in kglobalaccel being spawned as root ⇒
catastrophe!

global.org

@@ -2433,11 +2433,10 @@
     #+begin_src emacs-lisp
       (defun kde-current-activity ()
         "Returns the current KDE activity"
-        (substring (shell-command-to-string "qdbus org.kde.ActivityManager /ActivityManager/Activities org.kde.ActivityManager.Activities.CurrentActivity") 0 -1)
-        )
+        (substring (let ((default-directory "~")) (shell-command-to-string "qdbus org.kde.ActivityManager /ActivityManager/Activities org.kde.ActivityManager.Activities.CurrentActivity")) 0 -1))
       (defun kde-current-activity-name ()
         "Returns the name of the current KDE activity"
-        (substring (shell-command-to-string (concat "qdbus org.kde.ActivityManager /ActivityManager/Activities org.kde.ActivityManager.Activities.ActivityName " (kde-current-activity))) 0 -1))
+        (substring (let ((default-directory "~")) (shell-command-to-string (concat "qdbus org.kde.ActivityManager /ActivityManager/Activities org.kde.ActivityManager.Activities.ActivityName " (kde-current-activity)))) 0 -1))
     #+end_src
 
     #+begin_src emacs-lisp