Fix Feeder Cattle (GF) tick size to $0.00025/lb (#9492) (#9493)

GF's minimum_price_variation in the symbol-properties database was
0.025 (cents per pound), inconsistent with every other livestock entry
which uses dollars per pound. CME's official spec is $0.00025/lb
($12.50/tick on 50,000 lb), matching LE and HE.

With price_magnifier=100 the prior value produced an effective per-
contract tick value of $1,250 instead of $12.50, putting algorithm-
rounded prices on a grid 100x coarser than the exchange grid and
causing rejected/unreachable orders on GF.

https://www.cmegroup.com/markets/agriculture/livestock/feeder-cattle.contractSpecs.html

Author: AlexCatarino

Data/symbol-properties/symbol-properties-database.csv

@@ -272,7 +272,7 @@ cme,FT5,future,E-mini FTSE China Futures,USD,2.0,2.5,1.0
 cme,FTU,future,E-mini FTSE 100 USD Futures,USD,50.0,0.1,1.0
 cme,GD,future,S&P-GSCI Commodity Index Futures,USD,250.0,0.05,1.0
 cme,GE,future,Eurodollar Futures,USD,2500.0,0.0025,1.0
-cme,GF,future,Feeder Cattle Futures,USD,50000.0,0.025,1.0,,1,100
+cme,GF,future,Feeder Cattle Futures,USD,50000.0,0.00025,1.0,,1,100
 cme,HE,future,Lean Hog Futures,USD,40000.0,0.00025,1.0,,1,100
 cme,IBV,future,USD-Denominated Ibovespa Index Futures,USD,1.0,5.0,1.0
 cme,J7,future,E-mini Japanese Yen Futures,USD,6250000.0,1e-06,1.0