Add initializing HP first when maxHP is zero

[kamejosh]

Summary

• Allow setting of HP before max HP if max HP is still 0. Setting HP this way also sets max HP (see Initializing Token in help window).

[render[bot]]

Your Render PR Server URL is https://hp-tracker-pr-24.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-cjvjk1h5mpss73c83av0.