Price fixes

Update all prices than differed more than 10 cr from the values seen at
Jameson memorial.  And yes, I took both discounts (Jameson + elite rank)
into account.

modules/standard/fuel_tank.json

@@ -79,7 +79,7 @@
     },
     {
       "class": 8,
-      "cost": 5428400,
+      "cost": 5428431,
       "edID": 128064353,
       "eddbID": 1206,
       "fuel": 256,
@@ -89,4 +89,4 @@
       "symbol": "Int_FuelTank_Size8_Class3"
     }
   ]
-}
+}