manager: Remove unnecesary includes

These are included through the header already,
no need to include them explicitly here again.

Gbp-Dch: Ignore

Signed-off-by: Evangelos Ribeiro Tzaras <devrtz@fortysixandtwo.eu>
Part-of: <https://gitlab.gnome.org/GNOME/calls/-/merge_requests/804>

src/calls-manager.c

@@ -28,12 +28,10 @@
 #include "calls-config.h"
 
 #include "calls-account.h"
-#include "calls-contacts-provider.h"
 #include "calls-manager.h"
 #include "calls-message-source.h"
 #include "calls-plugin-manager.h"
 #include "calls-provider.h"
-#include "calls-settings.h"
 #include "calls-ui-call-data.h"
 #include "calls-ussd.h"
 #include "calls-util.h"