Fixed submachine parent state bug.

[kenomo]

If the order of state machines (including submachines) in the .xmi file was not hierarchical, the main region of the submachine was not assigned a parent state.

[codecov[bot]]

Codecov Report

Merging #22 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #22   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files           4        4           
  Lines         480      480           
=======================================
  Hits          476      476           
  Misses          4        4           

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