small FRLG RNG tweaks and fixes

[theastrogoth]

This makes a few small changes that are mostly relevant to the Roaming Legendary RNG program

• small fix for flying to Pallet Town (unused by other programs up to now)
• small stability improvement when exiting a battle in auto_catch()
• better box placement in PartyLevelUpDetector (avoids issues with 3-digit stat totals)
• fixed bug preventing RNG history updates when hits are all_indistinguishable()
• changed default ball throws to 30 to match Safari game
• reduced max values for Rare Candies in RNG programs