fix: phone number and email labels (#29)

Author: KishanBagaria

contacts.mm

@@ -214,7 +214,7 @@
     CNPhoneNumber *phone_number =
         [CNPhoneNumber phoneNumberWithStringValue:number];
     CNLabeledValue *labeled_value =
-        [CNLabeledValue labeledValueWithLabel:@"mobile" value:phone_number];
+        [CNLabeledValue labeledValueWithLabel:CNLabelPhoneNumberMobile value:phone_number];
     [phone_numbers addObject:labeled_value];
   }
 
@@ -232,7 +232,7 @@
         email_address_data.Get(i).As<Napi::String>().Utf8Value();
     NSString *email = [NSString stringWithUTF8String:email_str.c_str()];
     CNLabeledValue *labeled_value =
-        [CNLabeledValue labeledValueWithLabel:@"home" value:email];
+        [CNLabeledValue labeledValueWithLabel:CNLabelHome value:email];
     [email_addresses addObject:labeled_value];
   }