Changing Chi2 Cut from 40 -> 50

Based on S/sqrt(S+B) for TopTag channel chi2 optimization. Average maximum = 48, chose 50:

Signal
Chi2Cut S/sqrt(S+B)

RSG1000
40 2.45730897211
50 2.47650525832

RSG2000
40 7.66620630936
50 7.7496047095

RSG3000
40 5.38853663258
50 5.43599141621

RSG4000
40 4.05807258473
50 4.05146696416

ZP1000w10
40 3.86757305459
50 3.85309204422

ZP1000w100
40 3.44962840954
50 3.44745195916

ZP2000w20
40 13.8277535613
50 13.8862060083

ZP2000w200
40 11.5949155103
50 11.6257070754

ZP3000w30
40 11.4114067493
50 11.5050378743

ZP3000w300
40 8.94157831384
50 9.00004022157

ZP4000w40
40 7.00351172318
50 7.02068686341

ZP4000w400
40 6.22211992735
50 6.23067703913