extend the low health warning to half hp in explore battles

Hi!

The low health warning before the battles in explore is great, and often keeps me from engaging in a losing battle - I'm not great at tracking how much hp I have left.

Could we extend the warning to whenever your lead is at half or less hp, rather than the current, dunno, less than 10 hp, or less than 10% hp? Because I still sometimes fight battles I'd have healed before if I had noticed my health, and, I dunno about others, but having even 30% of my hp at the start of a battle makes me nervous.

I'd be curious to have to opinion of others about when they generally heal (or, like, when they would like to have the "low health" warning), and how it relates to their wolf's level (I almost always heal if I'm at half or less hp, with a lv 19 and now 20 wolf).

It should be a minor enough tweak to the code I guess.