[ox] Fix remaining implicit conversion issues

deps/ox/src/ox/mc/presenceindicator.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 - 2022 gary@drinkingtea.net
+ * Copyright 2015 - 2023 gary@drinkingtea.net
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -11,6 +11,8 @@
 #include <ox/std/error.hpp>
 #include <ox/std/types.hpp>
 
+#include "err.hpp"
+
 namespace ox {
 
 template<typename T>
@@ -83,9 +85,9 @@ constexpr Error FieldBitmap::set(std::size_t i, bool on) noexcept {
 		if (on) {
 			m_map[i / 8] |= 1 << (i % 8);
 		} else {
-			m_map[i / 8] &= ~(1 << (i % 8));
+			m_map[i / 8] &= ~static_cast<uint8_t>(1 << (i % 8));
 		}
-		return OxError(0);
+		return {};
 	} else {
 		return OxError(MC_PRESENCEMASKOUTBOUNDS);
 	}