Scale "etank regen rate" when switching between samus and morph based on energy per etank

[steven11sjf]

Just something I noticed in a multi with someone who set their energy per tank to 1000. it can take multiple rooms to refill the energy bar to the correct value at high values.

Probably need to find which function increases the displayed number each frame, and scale that factor by ETANK_CAPACITY / 100.