chore: remove old character data file

sonic-bluestreak.love/datas/subgame/sonic-boost/characters.lua

@@ -1,20 +0,0 @@
-return {
-  ["sonic"] = {
-    name          = "Sonic",
-    fullname      = "Sonic the Hedgehog", -- Nom qu'on affiche quand on veut le complet
-    stats = {
-      spd        = 5,
-      jmp        = 3,
-      jumpaction = "jumpdash",
-      jumpaction_power = 2,
-      action        = "spinattack",
-      action_power  = 1,
-      breakcraft = false, -- brise les objets fragile rien qu'au contact
-    },
-    assets = {
-      lifeicon = 1,
-      spriteset = "sonic",
-    },
-    unlocked = true
-  },
-}