FP2-1336: Renaming default phone ringtone.

Update default ringtone reference.

Change-Id: I9bddcda7004d4ab4c3b428371ab78424e1b0c148
diff --git a/target/product/full_base.mk b/target/product/full_base.mk
index 86e4b09..42666b4 100644
--- a/target/product/full_base.mk
+++ b/target/product/full_base.mk
@@ -41,7 +41,7 @@
 # Additional settings used in all AOSP builds
 PRODUCT_PROPERTY_OVERRIDES := \
     ro.com.android.dateformat=MM-dd-yyyy \
-    ro.config.ringtone=Sunbeam.mp3 \
+    ro.config.ringtone=Fairphone.mp3 \
     ro.config.notification_sound=pixiedust.ogg
 
 # Put en_US first in the list, so make it default.