[calls] account: Use explicit notify for account state property

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 82ff6d0ac5b9e4ed7797c26fb679d05993eec20c
Author: Evangelos Ribeiro Tzaras <evangelos tzaras puri sm>
Date:   Sun Jul 4 02:37:35 2021 +0200

    account: Use explicit notify for account state property

 src/calls-account.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/src/calls-account.c b/src/calls-account.c
index b41aec8a..4dde3494 100644
--- a/src/calls-account.c
+++ b/src/calls-account.c
@@ -45,7 +45,9 @@ calls_account_default_init (CallsAccountInterface *iface)
                        "The state of the account",
                        CALLS_TYPE_ACCOUNT_STATE,
                        CALLS_ACCOUNT_NULL,
-                       G_PARAM_READABLE));
+                       G_PARAM_READABLE |
+                       G_PARAM_STATIC_STRINGS |
+                       G_PARAM_EXPLICIT_NOTIFY));
 }
 
 /**