Remove =+1 -> =1 since mcstas-pygen -> McStasscript may experience

issues in e.g. instr.show_diagram(analysis=True)

Author: willend

mcstas-comps/sources/Source_gen.comp

@@ -131,7 +131,7 @@ radius=0.0, dist=0, focus_xw=0.045, focus_yh=0.12, focus_aw=0, focus_ah=0,
 E0=0, dE=0, lambda0=0, dlambda=0, I1=1,
 yheight=0.1, xwidth=0.1, verbose=0, T1=0,
 flux_file_perAA=0, flux_file_log=0,
-Lmin=0,Lmax=0,Emin=0,Emax=0,T2=0,I2=0,T3=0,I3=0,zdepth=0, int target_index=+1)
+Lmin=0,Lmax=0,Emin=0,Emax=0,T2=0,I2=0,T3=0,I3=0,zdepth=0, int target_index=1)
 
 /* Neutron parameters: (x,y,z,vx,vy,vz,t,sx,sy,sz,p) */