simplify cork interface related

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/engine.rs

@@ -122,7 +122,7 @@ impl Engine {
 
 	pub fn sync(&self) -> Result<()> { result(DBCommon::flush_wal(&self.db, true)) }
 
-	pub(crate) fn corked(&self) -> bool { self.corks.load(std::sync::atomic::Ordering::Relaxed) > 0 }
+	pub fn corked(&self) -> bool { self.corks.load(std::sync::atomic::Ordering::Relaxed) > 0 }
 
 	pub(crate) fn cork(&self) {
 		self.corks