fix dmrg2

Author: AFeuerpfeil

src/algorithms/groundstate/dmrg.jl

@@ -154,6 +154,7 @@ function find_groundstate!(::FiniteChainStyle, ψ, H, alg::DMRG2, envs = environ
     log = IterLog("DMRG2")
     timeroutput = TimerOutput("DMRG2")
     alg.verbosity > 3 || disable_timer!(timeroutput)
+    prepare = alg.prepare
 
     E = 0.0
 
@@ -176,7 +177,7 @@ function find_groundstate!(::FiniteChainStyle, ψ, H, alg::DMRG2, envs = environ
                     @timeit timeroutput "svd_trunc" begin
                         al, c, ar = svd_trunc!(newA2center; trunc = trscheme, alg = alg.alg_svd)
                         al, c = changebonds_left(al, c, expscheme; ac2 = ac2)
-                normalize!(c)
+                        normalize!(c)
                         v = @plansor backend=backend allocator=allocator ac2[1 2; 3 4] * conj(al[1 2; 5]) * conj(c[5; 6]) * conj(ar[6; 3 4])
                         ϵs[pos] = max(ϵs[pos], abs(1 - abs(v)))
                     end