grpc: Fix onReady() listener delegation (KRPC-220)

Signed-off-by: Johannes Zottele <[email protected]>

Author: Jozott00

grpc/grpc-core/src/nativeMain/kotlin/kotlinx/rpc/grpc/internal/NativeServerCall.kt

@@ -354,4 +354,5 @@ private class DeferredCallListener<T> : ServerCall.Listener<T>() {
     override fun onHalfClose() = deliver { it.onHalfClose() }
     override fun onCancel() = deliver { it.onCancel() }
     override fun onComplete() = deliver { it.onComplete() }
+    override fun onReady() = deliver { it.onReady() }
 }