fix comments in input script

test harness does not like the degree sign

Author: danielque

tutorials/cfdemSolverRhoPimpleChem/PolydisperseFluidizedBed/R1_FB/DEM/in.liggghts_run

@@ -1,5 +1,5 @@
 ################################################################################
-# brief: chemistry in fluidized bed - reduce FeO to Fe at 993 K (720 °C)       #
+# brief: chemistry in fluidized bed - reduce FeO to Fe at 993 K (720 C)        #
 #                                                                              #
 # Cf. M.E. Kinaci,T. Lichtenegger,S. Schneiderbauer, Chem. Eng. Sci. 227 (2020)#
 # Note that reaction rate is scaled x10                                        #

tutorials/cfdemSolverRhoPimpleChem/PolydisperseFluidizedBed/R2_FB/DEM/in.liggghts_run

@@ -1,5 +1,5 @@
 ################################################################################
-# brief: chemistry in fluidized bed - reduce Fe3O4 to FeO at 1023K (750 �C)    #
+# brief: chemistry in fluidized bed - reduce Fe3O4 to FeO at 1023 K (750 C)    #
 #                                                                              #
 # Cf. M.E. Kinaci,T. Lichtenegger,S. Schneiderbauer, Chem. Eng. Sci. 227 (2020)#
 # Note that reaction rate is scaled x10                                        #

tutorials/cfdemSolverRhoPimpleChem/PolydisperseFluidizedBed/R3_FB/DEM/in.liggghts_run

@@ -1,5 +1,5 @@
 ################################################################################
-# brief: chemistry in fluidized bed - reduce Fe2O3 to Fe3O4 at 753K (480°C)    #
+# brief: chemistry in fluidized bed - reduce Fe2O3 to Fe3O4 at 753 K (480 C)   #
 #                                                                              #
 # Cf. M.E. Kinaci,T. Lichtenegger,S. Schneiderbauer, Chem. Eng. Sci. 227 (2020)#
 # Note that the reaction rate is scaled x10 and the reaction point R3 has been #