Update FFI for new parameters in year_month and month_day

Author: HenrikTennebekk

temporal_capi/src/plain_month_day.rs

@@ -84,9 +84,9 @@ pub mod ffi {
             let _ = write.write_str(code.as_str());
         }
 
-        pub fn to_plain_date(&self) -> Result<Box<PlainDate>, TemporalError> {
+        pub fn to_plain_date(&self, year: Option<i32>) -> Result<Box<PlainDate>, TemporalError> {
             self.0
-                .to_plain_date()
+                .to_plain_date(year)
                 .map(|x| Box::new(PlainDate(x)))
                 .map_err(Into::into)
         }

temporal_capi/src/plain_year_month.rs

@@ -160,9 +160,9 @@ pub mod ffi {
                 .map(|x| Box::new(Duration(x)))
                 .map_err(Into::into)
         }
-        pub fn to_plain_date(&self) -> Result<Box<PlainDate>, TemporalError> {
+        pub fn to_plain_date(&self, day: Option<u8>) -> Result<Box<PlainDate>, TemporalError> {
             self.0
-                .to_plain_date()
+                .to_plain_date(day)
                 .map(|x| Box::new(PlainDate(x)))
                 .map_err(Into::into)
         }