Fixes memory leaks in unit test.

tests/ScriptTests/BaseScriptClassTests.cpp

@@ -403,7 +403,9 @@ TEST_CASE("Add Volatile with return script function") {
     REQUIRE(ctx->GetReturnDWord() == 1);
     ctxPool->ReturnContextToPool(ctx);
 
+    delete mon;
     delete script;
+    delete mainLib;
 }
 
 #endif