rfix: emove extra eq_idxs method

Author: vyudu

src/linearization.jl

@@ -143,17 +143,6 @@ function eq_idxs(sys::AbstractSystem)
     diff_idxs, alge_idxs
 end
 
-"""
-Return the set of indexes of differential equations and algebraic equations in the simplified system.
-"""
-function eq_idxs(sys::AbstractSystem)
-    eqs = equations(sys)
-    alge_idxs = findall(!isdiffeq, eqs)
-    diff_idxs = setdiff(1:length(eqs), alge_idxs)
-
-    diff_idxs, alge_idxs
-end
-
 """
     $(TYPEDEF)