Move player pausing to hook ('iam.afk')

src/libexec/saturnin-iam

@@ -52,7 +52,7 @@ i_am_afk() {
     #
     # away from keyboard; blocks until i'm back again
     #
-    mocp --pause
+    saturnin_runhook "afk"
     set_status "afk"
     saturnin kb home    # make sure to set lang to default before locking
     slock