[calls] ringer: Switch to state notify signal

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 2f32e099824ccf25cc9d11861e52968376161ede
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Fri Jan 21 10:18:57 2022 +0100

    ringer: Switch to state notify signal

 src/calls-ringer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/calls-ringer.c b/src/calls-ringer.c
index 200b67f3..cdc65a74 100644
--- a/src/calls-ringer.c
+++ b/src/calls-ringer.c
@@ -370,7 +370,7 @@ call_added_cb (CallsRinger *self,
   self->calls = g_list_append (self->calls, call);
 
   g_signal_connect_swapped (call,
-                            "state-changed",
+                            "notify::state",
                             G_CALLBACK (update_ring),
                             self);
   g_signal_connect_swapped (call,