[libromdata/tests] FilterCacheKeyTest, filterCacheKey_EINVAL_wchar_t:…

… Cast to `wchar_t*`, not `const wchar_t*`.

src\libcachecommon\tests\FilterCacheKeyTest.cpp(264): error C2665: 'LibCacheCommon::filterCacheKey': none of the 4 overloads could convert all the argument types

src/libcachecommon/tests/FilterCacheKeyTest.cpp

@@ -261,7 +261,7 @@ TEST_F(FilterCacheKeyTest, filterCacheKey_EINVAL_wchar_t)
 	wchar_t cache_key[2] = {L'\0', L'\0'};
 
 	// Test NULL pointer.
-	EXPECT_EQ(-EINVAL, LibCacheCommon::filterCacheKey(static_cast<const wchar_t*>(nullptr)));
+	EXPECT_EQ(-EINVAL, LibCacheCommon::filterCacheKey(static_cast<wchar_t*>(nullptr)));
 
 	// Test an empty string.
 	EXPECT_EQ(-EINVAL, LibCacheCommon::filterCacheKey(cache_key));