* Change custom text in Skip Powder Keg Certification enhancement to only happen in non-rando/vanilla save file types
* Update Medigoron Rando Check logic to account for Snowhead Temple clear
* Fix various Medigoron Rando behavior issues
* Change RC_GORON_VILLAGE_MEDIGORON to use FLAG_NONE
This is done because there are multiple ways the reward dialogue can be granted to the player that do not necessarily involve blowing up the racetrack boulder, and thus the check is not tied ONLY to the week event reg.