Check for redundant variables in the OperatorSplittingIntegrator

[termi-official]

Check if

Thunderbolt.jl/src/solver/operator_splitting/integrator.jl

Lines 29 to 35 in 5862065

	dt::tType # This is the time step length which which we intend to advance
	_dt::tType # This is the time step length which which we use during time marching
	dtchangeable::Bool # Indicator whether _dt can be changed
	tstops::heapType
	_tstops::tstopsType # argument to __init used as default argument to reinit!
	saveat::heapType
	_saveat::saveatType # argument to __init used as default argument to reinit!

contains redundancies and eliminate them to simplify the code if possible.