bugfix for lft, issue #577

[olof3]

The indices for what to connect to the Delta block were completely messed up.

Closes #577.

[codecov]

Codecov Report

Merging #578 (c79d757) into master (ad1306c) will decrease coverage by 0.66%.
The diff coverage is 100.00%.

❗ Current head c79d757 differs from pull request most recent head ce44332. Consider uploading reports for the commit ce44332 to get more accurate results

@@            Coverage Diff             @@
##           master     #578      +/-   ##
==========================================
- Coverage   84.99%   84.33%   -0.67%     
==========================================
  Files          31       31              
  Lines        3073     3109      +36     
==========================================
+ Hits         2612     2622      +10     
- Misses        461      487      +26     

Impacted Files	Coverage Δ
src/connections.jl	93.25% <100.00%> (+0.03%)	⬆️
src/matrix_comps.jl	82.46% <0.00%> (-5.56%)	⬇️
src/types/StateSpace.jl	88.42% <0.00%> (-4.00%)	⬇️
src/delay_systems.jl	88.75% <0.00%> (-0.93%)	⬇️
src/types/TransferFunction.jl	91.20% <0.00%> (-0.93%)	⬇️
src/ControlSystems.jl	100.00% <0.00%> (ø)
src/plotting.jl	76.47% <0.00%> (+0.05%)	⬆️
src/types/conversion.jl	96.29% <0.00%> (+0.08%)	⬆️
src/types/zpk.jl	97.43% <0.00%> (+0.21%)	⬆️
... and 10 more

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