omni: Set default ringtone for SIM 2

Change-Id: I2b9e57330cfdf5665fcf84547185e526fc22a821
diff --git a/config/common.mk b/config/common.mk
index c44cd5b..a03815c 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -76,7 +76,7 @@
 
 # custom omni sounds
 PRODUCT_SYSTEM_DEFAULT_PROPERTIES += \
-    ro.config.ringtone=omni_ringtone1.ogg \
+    ro.config.ringtone=omni_ringtone1.ogg,omni_ringtone1.ogg \
     ro.config.notification_sound=omni_notification1.ogg \
     ro.config.alarm_alert=omni_alarm1.ogg