[calls] mm: call: Use correct enum type

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 07aa990601e6647a68e2aaf712a89569207e0c15
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Sun Jun 19 17:22:27 2022 +0200

    mm: call: Use correct enum type
    
    They both have the same value (=0), and things worked because of
    implicit conversion, but was still confusing and technically wrong.

 plugins/mm/calls-mm-call.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/plugins/mm/calls-mm-call.c b/plugins/mm/calls-mm-call.c
index bfe15e61..121c40f8 100644
--- a/plugins/mm/calls-mm-call.c
+++ b/plugins/mm/calls-mm-call.c
@@ -273,7 +273,7 @@ constructed (GObject *object)
 
   state = mm_call_get_state (self->mm_call);
   state_changed_cb (self,
-                    MM_MODEM_STATE_UNKNOWN,
+                    MM_CALL_STATE_UNKNOWN,
                     state,
                     mm_call_get_state_reason (self->mm_call));