change eta gap (#2125)

Author: jpxrk

MC/config/PWGHF/ini/GeneratorHF_HFe_ccbar_and_bbar_gap5_Mode2.ini

@@ -1,7 +1,7 @@
 ### The external generator derives from GeneratorPythia8.
 [GeneratorExternal]
 fileName=${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGHF/external/generator/generator_pythia8_gaptriggered_hf.C
-funcName=GeneratorPythia8GapTriggeredCharmAndBeauty(5, -1.5, 1.5)
+funcName=GeneratorPythia8GapTriggeredCharmAndBeauty(5, -1., 1.)
 
 [GeneratorPythia8]
 config=${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGHF/pythia8/generator/pythia8_HFe_Mode2.cfg