Bugfix: Running .optimize() for a RQAOA object not working as expected

[raulconchello]

Before, if one optimized twice a RQAOA object, the second time wasn't working as expected. Because the self._q.was compiled with the last problem of the first optimization.

TODO

• [x] Every time that .optimize() is run the whole RQAOA process should restart
• [x] Check that now everything works as expected
• [x] Write some test that can check that this is the case

[codecov[bot]]

Codecov Report

Merging #125 (91ad696) into dev (80b0b6b) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #125   +/-   ##
=======================================
  Coverage   87.30%   87.31%           
=======================================
  Files          67       67           
  Lines        8924     8930    +6     
=======================================
+ Hits         7791     7797    +6     
  Misses       1133     1133           

Impacted Files	Coverage Δ
openqaoa/workflows/optimizer.py	89.69% <100.00%> (ø)
tests/test_workflows.py	100.00% <100.00%> (ø)

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