Fix shop item names

[pinterior]

shopAmbrosiaLuck3 and 4 are named 'Generation Speedup' instead of 'Luck Increaser'

these names are not visible on game screen afaik, but written in 'Savefile Stats Summary' like below:

[★] Ambrosia Generation Speedup: Level 25/25
[★] Another Ambrosia Generation Speedup: Level 30/30
[★] A better Ambrosia Generation Speedup: Level 35/35
[?] A FINAL Ambrosia Generation Speedup: Level 110/1000
[★] Ambrosia Luck Increaser: Level 40/40
[★] Another Ambrosia Luck Increaser: Level 50/50
[★] A better Ambrosia Generation Speedup: Level 60/60
[?] A FINAL Ambrosia Generation Speedup: Level 100/1000